Many sponges, cnidarians, and echinoderms have few if any external characteristics distinguishing males from females. This seemingly odd structural characteristic is most likely associated with which of these functions?
A) substrate feeding
B) reproducing asexually only
C) reproducing by spawning (simultaneous release of gametes into the water for fertilization)
D) having a gastrovascular cavity that takes up most of the internal space.
Answer: D
You might also like to view...
Directional selection occurs when
a. the environment controls which organisms will survive. b. humans determine which organisms will survive. c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
The disinfecting properties of Lysol, a common household disinfectant, depend upon the presence of ________.
What will be an ideal response?
The association of nitrogen fixing bacteria of the genus Rhizobium with legumes such as peas is an
example of mutualism. ____________________ Indicate whether the statement is true or false.
Mammal-like reptiles arose during which time period?
a. Triassic period b. Cambrian period c. Devonian period d. Cretaceous period e. Carboniferous period