The most successful animals that have ever
evolved are the
a. chordates.
b. insects.
c. humans.
d. annelids.
e. crustaceans
B
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Most plants are firmly rooted in place and are not mobile. Which of the following is not an adaptation to this condition?
A. growth by mitosis B. the presence of hairs, spines, and toxins C. the ability to survive long periods of unfavorable conditions D. cell walls
An open circulatory system differs from a closed one in that:
A. The open circulatory system has a combination of blood vessels and large thin-walled sinuses whereas a closed circulatory system has only vessels. B. A closed circulatory system is completely encased in the body cavity whereas the open one is not. C. An open circulatory system opens into the heart whereas the closed circulatory system does not. D. An open circulatory system opens into arteries and is drained by veins whereas in a closed one it is just the reverse. E. An open circulatory system drains into the mantle cavity whereas a closed circulatory system drains into the hemolymph.
Tissue-building steroids are known as
a. catabolic. b. metabolic. c. anabolic. d. actinic. e. nicotinic.
The earliest Homo sapiens fossils are ca. 200,000 years old. Could you use radiocarbon dating to determine the age of fossils from that period? Briefly justify your answer in the space provided below
What will be an ideal response?