Which of the following were probably factors that permitted early plants to successfully colonize land?
1. the relative number of potential predators (herbivores)
2. the relative number of competitors
3. the relative availability of symbiotic partners
4. air's relative lack of support, compared to water's support
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 1, 2, and 3
D
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A genetic mutation causes an individual to produce hemoglobins that do not change their binding affinity for oxygen, even after oxygen binds to a single heme site. How will this mutation affect the transport of oxygen through the individual's bloodstream?
A. More oxygen will be transported by hemoglobin to tissues throughout the body. B. Less oxygen will be transported by hemoglobin to tissues throughout the body. C. The same amount of oxygen will be transported by hemoglobin to tissues throughout the body.
Human females are the ________ sex.
A) homozygous B) homogametic C) hemizygous D) heterozygous
Radially symmetrical animals have loose meshes of neurons that are called
a. nerve nets. b. brain nets. c. ganglia nets. d. nerve cords. e. cephalization nets.
Which of these is/are considered lateral meristem(s)?
a. apical meristems only b. vascular cambium only c. cork cambium only d. pericycle and periderm e. vascular cambium and cork cambium