During the Beagle journey, Darwin visited islands, allowing him to compare island species with continental species. In terms of framing his theory of evolution, why was this significant?
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments.
B. Because the island species no longer shared traits with their continental ancestors.
C. Because the species he saw on the islands had not changed from their ancestral continental form.
D. Because the island species had very low reproductive and survival rates as compared with their continental ancestors.
A. Because the island species had both similarities to their continental ancestors and unique adaptations to their island environments.
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According to the modern classification scheme, which animal would be a spider's closest relative?
A. A snail B. An earthworm C. A tapeworm D. A roundworm E. A squid Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about protostome phylogeny? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Blood from the body enters the __________ of the heart
a. atria b. ventricles c. aorta d. coronary arteries
Water enters the water vascular system of echinoderms through the:
a. spines. b. mouth. c. madreporite. d. tubercle. e. tube feet.
Spongiform encephalopathies are
A. caused by prions. B. Creutzfeld-Jacob disease, kuru, and Gertsmann-Strussler-Scheinker syndrome. C. associated with abnormal, transmissible, protein in the brain. D. chronic, fatal infections of the nervous system. E. All of the choices are correct.