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What were the first living things to evolve on earth? |
What substance flows over the land from precipitation or melting snow or ice? |
Methanogens in their gut enable what process in cows? |
What is defined as maintaining a stable internal environment? |
In a food chain, only about 10 percent of what passes to the next level? |
What are the taste receptors found as tiny bumps on the tongue called? |
What happens do the sound during a resonance? |
What term describes a gene or sequence on a chromosome that co-segregates (shows genetic linkage) with a specific trait? |
What is the name for an underground layer of rock that is saturated with groundwater? |
What category of food includes sugars, starches and fibers? |
What kind of ions are named by adding the suffix -ide to the end? |
What is the layer above the troposphere? |
Torpor, a process that leads to a decrease in activity and metabolism and allows animals to survive adverse conditions, includes what long winter 'sleep'? |
The lithosphere-asthensophere divisions are based on what? |
The interaction of what opposite factors describe a biome and ecosystem? |
What makes up the core of the endoskeleton? |
What are the three types of symbiotic relationships? |
What is the most common cause of cancer? |
What is the process of the blastula forming 3 layers of cells called? |
When leaves wilt, what plant process ceases? |
Echinoderms have a unique system for gas exchange, nutrient circulation, and locomotion called the water vascular system. the system consists of a central ring canal and radial canals extending along each arm. water circulates through these structures allowing for gas, nutrient, and this? |
Most scientists think that ordinary matter is less than half of the total matter in the universe; the remaining part includes what mysterious entity? |
How do organophostbate pesticides work? |
Just under their skin, marine mammals have a very thick layer of insulating fat called what? |
What results from the consumption of pathogenic bacteria, viruses, or parasites that contaminate food? |
Fibrous root systems have many small branching roots called what? |
Although some have suggested that the uvula is what type of organ, it actually serves an important purpose? |
Every species has a characteristic number of what? |
Underground rock in a molten state is called? |
What phase of a human life does not have a definite starting point? |
The vas deferens and ejaculatory ducts are part of what system? |
What celestial object has been visited by manned spacecraft and is easily seen from earth? |
Hard igneous rocks and easily dissolved sedimentary rocks respond very differently to what natural force? |
Rounded grains indicate that the minerals eroded from what? |
Cells infected with viruses secrete what example of early induced proteins, which travel to adjacent cells and induce them to make antiviral proteins, a sacrifice that protects the surrounding cells? |
What is the term for the difference in elevation between two contour lines? |
What color does red litmus paper turn in the presence of a base? |
Many innovative farming methods can prevent what type of erosion, which is especially important in agriculture? |
What two forces tend to keep an animal stationary and thus oppose locomotion? |
When a predator kills and eats its prey, what sort of predation is this referred to as? |
What doctors specialize in diseases stemming from glandular issues? |
The length of a rectangular surface multiplied by its width is equal to what? |
How many main types of diabetes are there? |
What is the enclosed, fluid-filled membrane that surrounds and protects the fetus and is attached to the placenta? |
What leads to the buildup of electric charges on objects? |
Phase labels - and even special conditions - are sometimes included for the substances that are part of what? |
What is the term for genes that control the expression of other genes within specific regions of cells in the developing organism? |
What is the science of how traits are passed from parents to offspring? |
What are the two most abundant elements in the universe? |
Steam consists of what common and essential element in its gaseous phase? |
What term describes the number of items in a given area or volume? |
Two events are defined to be simultaneous if an observer measures them as occurring at what? |
Hormones send what through your body? |
During which process in bacteria do the chromosome replicates and the two daughter chromosomes actively move apart? |
The most common carbon atoms have six protons and six neutrons in their what? |
What is absorbed from food waste in the large intestine before it passes out of the body as feces? |
The accumulation of what cells begin the development of the vertebral column and thoracic cage? |
Graded potentials are temporary changes in what, the characteristics of which depend on the size of the stimuli? |
What gems are created by mollusks, such as oysters? |
What is the measure of how closely molecules are packed together? |
What is the technical term for species that produce their own body heat and regulate their internal temperature independently of the outside temperature? |
The laws of what field of science apply to galaxies and atoms, an indication of the underlying unity in the universe? |
The nuclear envelope is a double-layered plasma membrane like the cell membrane, although without what? |
What type of friction is friction that acts on objects when they are sliding over a surface? |
Mushrooms are an example of what type of organism, which includes beneficial and toxic specimens? |
Mineralocorticoids are hormones synthesized by the adrenal cortex that affect what balance, by regulating sodium and water levels? |
What term describes a disease in which the immune system attacks the body’s own cells? |
Algae is a promising alternative to traditional crops for what type of fuels? |
Because it produces oxygen, what plant process was necessary for the evolution of animals? |
Mammals are endothermic vertebrates that have four limbs and produce what type of eggs? |
What does a pollinator pick up from its body and carry directly to another plant of the same species? |
Breasts are considered accessory organs of what body system? |
What hydrocarbons contain only single bonds between carbon atoms? |
The most common elements have the most tightly bound __________. |
Platforms, arches, and sea stacks are all landforms created by what? |
What is a high concentrated solution typically referred to as? |
What phenomenon sometimes causes harmful alleles to become fixed? |
Angiosperms are also known as what? |
Strangeness, charm, bottomness, and topness are properties of what subatomic particle? |
Satellite and schwann cells are the two types of what kind of cell found in the pns? |
What is the general name for saturated hydrocarbons? |
Rather than being dead, dry, and brittle, what support structures of the human body consist of living tissues and are supplied with blood and nerves? |
Mammals can feed at various levels of food chains, as herbivores, insectivores, carnivores and what else? |
Ectotherms undergo a variety of changes at the cellular level to acclimatize to shifts in what? |
When a species always migrates, what is this type of migration called? |
Molds, pollen, and pet dander are examples of air pollution with what type of source? |
Which type of glaciers form several unique features through erosion, including cirques, arêtes, and horns? |
What happens when development of nervous system is disturbed? |
Monosaccharides, particularly glucose, are major nutrients for what? |
The measure of how much a given volume of matter decreases when placed under pressure is called? |
Although lots of symbiotic relationships help both organisms, sometimes one of the organisms is harmed. when that happens, the organism that benefits, and is not harmed, is called a what? |
The weather conditions in an area over time is also called a what? |
Flatworms have a concentration of nerve tissue in the head end, which was a major step in the evolution of what organ? |
Materials that can be magnetized are called? |
Many adolescents experience frequent mood swings. name one of the causes for this. |
What happens when materials return to their original shape? |
What are the three types of isomers? |
What happens when liquid water evaporates? |
What type of work called occurs when a system pushes back the surroundings against a restraining pressure? |
What is in the soil that causes mars to look red? |
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