Describe the principles of natural selection.
What will be an ideal response?
is that organisms will compete for resources.
most characteristics of organisms are inherited, or passed from parent to offspring.
offspring vary among each other in regard to their characteristics and those variations are inherited.
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Which structure prevents blood flowing back into the heart from the aorta between heartbeats?
A. semilunar valve B. atrioventricular valve C. tricuspid valve D. mitral valve E. ductus arteriosus
Which of the following statements is false?
a. Lizards are a very small component of the present-day reptiles. b. Lizards gave rise to the snakes. c. Some lizards are herbivorous. d. Some lizards can break off their tails when grabbed by predators. e. Some lizards startle potential predators by displaying a throat fan.
Members of a biological species CANNOT successfully interbreed with members of other species.
a. true b. false
The leaves of ginkgo trees are unique because they have
A. forked veins. B. veins in a netlike pattern. C. multiply branching veins. D. veins only around the edges. E. unbranched veins.