A fruit could best be described as:
A. developing from a flower
B. development from the ovule
C. an endosperm extension
D. part of the gametophyte generation
E. None of these is true
A. developing from a flower
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Which fishes feed on soft-bodied invertebrates and dead or dying fish and when threatened, secrete a slimy mucus?
a. lamprey b. hagfish c. skates d. rays e. ray-finned fishes
Which genetic disorder is caused by an expansion mutation?
a. cystic fibrosis b. muscular dystrophy c. color-blindness d. fragile X syndrome e. sickle-cell anemia
On a hot sunny day, which of the following would help protect a plant from water loss?
A. both cuticle and stomata B. cuticle only C. stomata only D. both cuticle and phloem E. both phloem and stomata
Current research in behavioral ecology focuses on the overall contribution that behavior makes to an animal's
A. competitive strategies. B. learning. C. length of life. D. foraging efficiency. E. fitness.