In summer, a(n) ____________________ prevents upper and lower waters from mixing. Fill in the blank(s) with the appropriate word(s)
ANSWER: thermocline
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The osmoregulatory/excretory system of an insect is based on the operation of _____
A) protonephridia B) metanephridia C) Malpighian tubules D) nephrons E) ananephredia
The first law of thermodynamics states that ________________________
A. combustion engines are 100% efficient B. energy cannot be created or destroyed C. only eukaryotic cells can produce ATP D. there is an increase in disorder in the universe over time E. the universe becomes more orderly over time
When you step on a cockroach or smash a fly, the blood appears colorless because
A. there are no cells in the hemolymph. B. the blood is enclosed in a closed circulatory system. C. it does not contain hemoglobin or any other respiratory pigment. D. the blood is actually a colorless hemolymph that carries oxygen on molecules other than reddish hemoglobin.
A human embryologist examines a 3-week-old embryo and notices that it has not developed a notochord. If the embryo survives, it will lack
A) a heart and lungs. B) skin and blood vessels. C) a stomach and a pancreas. D) a brain and a spinal cord.