Answer the following questions true (T) or false (F)
1. The Cambrian explosion followed extinction of the dinosaurs.
2. Vascular tissue is important for both efficient water distribution and taller growth in plants.
3. Both gymnosperms and angiosperms may be pollinated by animals.
1. FALSE
2. TRUE
3. FALSE
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In deuterostomes, early embryos undergo ____ cleavage
a. spiral, indeterminate b. radial, indeterminate c. spiral, determinate d. radial, determinate e. radial, followed by spiral
During radioactive decay, the nucleus of an atom ________
a. disintegrates, releasing particles and energy b. captures an unclaimed proton c. transposes its neutrons and electrons d. converts from a relatively stable to an unstable form
The pressure-flow hypothesis describes
A. how carbohydrates in solution move through the phloem. B. how carbohydrates and minerals move through the xylem. C. how hormones move through the phloem. D. how carbohydrates enter the sieve tubes. E. how water and minerals move through the xylem.
Cardiac output is determined by:
a. blood volume. b. venous return. c. blood pressure. d. stroke volume only. e. stroke volume and heart r