In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males
In this case, the sperm appear to be used only for _____. A) morphogenesis
B) egg activation
C) cell differentiation
D) the creation of a diploid cell
B
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Members of the class ______ have two stomachs, one of which can reach outside of its body to secrete digestive juices onto its prey to liquify it.
a. Asteroidea b. Ophiuroidea c. Holothuroidea d. Crinoidea
What happens in an electron transport chain?
a. Electrons move from a low energy level to a higher energy level. b. Electron movement transfers energy to enzymes and other molecules. c. Electron movement generates energy during each step. d. Energy from the electrons is stored for future use in pigments. e. The energy from the electron movement is used to break down ATP.
During extended periods of dehydration,
tardigrades a. enter suspended animation. b. migrate to the soil subsurface. c. enter small ponds and lakes. d. climb inside a plant leaf and encyst. e. none of these
Why do groups offer protection in foraging?
a. Large groups draw the attention of predators. b. Predator targeting increases with group size. c. The probability of predator attacks increases. d. Many eyes detect predators more quickly.