What type of mollusk has a closed circulatory system?
A. clam
B. snail
C. squid
D. slug
E. scallop
C. squid
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Ediacaran organisms lived during the _____ period.
A. Jurassic B. Silurian C. Devonian D. Cambrian E. Precambrian
The female plant structure on which a pollen grain will land is the:a
style. b. pistil. c. stigma. d. anther. e. style.
When auxin accumulates on the lower side of the shoot of a germinating seed, it
A) decreases the use of energy by the cells in the shoot. B) decreases cell elongation on the lower side of the shoot. C) has no effect on the shoot; it affects only the developing root. D) increases the use of energy by the cells in the shoot. E) increases cell elongation on the lower side of the shoot.
Which of these structures is not likely to contain significant amounts of aerenchyma tissue?
A. water lily leaves B. rice roots C. cypress "knees" D. mangrove pneumatophores E. coconut tree roots