Some major changes that occurred in horse body size, foot anatomy and tooth morphology are hypothesized to be due to natural selection because of ...
A. changes in global climates which resulted in changing environments from forest to grasslands.
B. changes in global climates which resulted in changing environments from grasslands to forests.
C. changing climates from dry to wet.
D. changing climates from wet to dry.
E. increase in reproduction of larger animals due to lack of water in the dry environment.
A. changes in global climates which resulted in changing environments from forest to grasslands.
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Reptiles resemble __________ in being able to
__________. a. ray-finned fishes; freely leave the water b. birds; breathe by use of lungs c. ostracoderms; utilize their jaws d. amphibians; exchange gases across their skin e. lobe-finned fishes; exchange gases across their gills
Aphid Secondary Symbionts (SS)
What will be an ideal response?
A bilaterally symmetrical, wormlike animal that has a complete digestive tract and a cuticle could be a member of which of the following phyla?
A) Cnidaria B) Annelida C) Nematoda D) Chordata
Which of the following best describes the pattern of microbial death?
A) The cells in a population die at a constant rate. B) All the cells in a culture die at once. C) Not all of the cells in a culture are killed. D) The pattern varies depending on the antimicrobial agent. E) The pattern varies depending on the species.