Answer the following questions true (T) or false (F)
1. Cleavage includes the stage of development between the zygote and blastula.
2. The blastula is the stage of embryonic development in which cells migrate.
3. Gastrulation begins at the sea urchin blastula's vegetal pole.
1. TRUE
2. FALSE
3. TRUE
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The tube feet of sea stars are used primarily for ____
a. excretion of excess water b. locomotion c. reproduction d. circulation e. sensation
What effect is warming predicted to have on migration behavior?
A) Birds will depart for migration earlier and return later. B) Birds will depart for migration later and return later. C) Birds will depart for migration earlier and return earlier. D) Birds will depart for migration later and return earlier.
Why is the cohesion of water important for biological systems?
A) It helps to moderate the temperature of cold-blooded animals. B) It helps transport water from the roots to the leaves of a plant. C) It prevents chemical reactions from occurring in body systems. D) It prevents salts from dissolving inside the plasma membrane.
The transfer of heat from arteries that carry warm blood past veins that carry cooler blood is an example of
A) insulation. B) countercurrent heat exchange. C) evaporative cooling. D) behavioral thermoregulation.