The first community that forms on bare rock often has organisms such as
A) broad-leaf trees and conifers.
B) grasses and weeds.
C) lichens and mosses.
D) herbs and conifers.
E) woody shrubs and conifers.
C
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Gastrulation is an important event in early embryonic development. Which of the following is NOT a result of gastrulation?
A) formation of three embryonic cell layers B) movement and alignment of many embryonic cells C) the formation of a gastrula D) the formation of specialized adult tissues
The vertebral column develops from
a. the notochord. b. the hollow, dorsal nerve cord. c. the gill slits. d. the tail. e. more than one of these
Stop codons are also called ________ codons.
A) nonsense
B) release factor
C) degeneracy
D) conversion
All of the following are examples of adaptations EXCEPT
A) flower coloration that attracts pollinators. B) larger teeth in beavers for gnawing wood. C) mice learning a maze to get food. D) different beak shapes for birds that eat seeds or insects. E) insects that resemble twigs.