Lions are heterotrophic carnivores living on the African savannah. They live in prides with
several females and a dominant male. Mating occurs in the summer. This describes the
organism’s __________.
a. habitat
b. niche
c. food web
d. carrying capacity
B
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Why do most viruses only infect one type of cell?
a. Viruses can only live in particular environments found within a select group of cells. b. Viruses can only find the necessary components to keep itself alive in one type of cell. c. Viruses can only infect cells that have the appropriate receptors for them to attach to. d. Viruses cannot move throughout the body so only infect the cells they first come into contact with.
Which layer of the digestive tract contains blood and lymph vessels?
a. mucosa b. circular muscle c. longitudinal muscle d. submucosa e. serosa
During the formation of a blood clot, conversion of prothrombin into the enzyme thrombin requires
A) mitochondria. B) transport of proteins from platelets. C) calcium ions. D) leukocytes. E) albumin.
Most conifers have separate male and female reproductive parts on the same tree. This condition is referred to as:
a. deciduous. b. dioecious. c. monoecious. d. homosporous. e. heterosporous