A zygote initially divides into smaller cells, each called a
A. blastomere.
B. gastrula.
C. neurula.
D. cleavage cell.
E. embryonic cell.
A. blastomere.
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The pair of traits that best illustrates convergent evolution is
A. an elephant's tusks and a beaver's teeth. B. a lizard's arm and a bird's wing. C. a dragonfly's wing and a butterfly's wing. D. a cartilage skeleton in a shark and a bone skeleton in a dolphin. 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 convergent evolution? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Which biome is represented by the map and climate diagrams?
A) deciduous forest B) coniferous forest C) tropical forest D) tundra
Tightly curled hair is caused by a dominant autosomal gene in humans. If a heterozygous curly-haired person marries a person with straight hair, what phenotypes (and in what proportions) are expected in the offspring?
What will be an ideal response?
Proteins that bind to foreign matter making it easier for phagocytosis are called
A) integrins. B) opsonins. C) leukotins. D) selectins. E) heparin.