what does HIV do? (T-helper)
What will be an ideal response?
HIV infects and slowly kills a specialized lymphocyte called the T-helper cell.
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Cell walls are found in ____
a. animal cells only b. plant cells only c. fungal cells only d. plant and fungal cells e. animal and plant cells
List the three major steps in the development of angiosperms.
What will be an ideal response?
Currently, two extant elephant species (X and Y) are placed in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?
A. Species X and Y are not related to species Z. B. Species X and Y share a common ancestor that is still extant (in other words, not yet extinct). C. Species X and Y are the result of artificial selection from an ancestral species Z. D. Species X and Y share a greater number of homologies with each other than either does with species Z. E. Species X, Y, and Z share a common ancestor, but nothing more can be claimed than this.
The ________ model of population growth assumes that essential resources are unlimited and that the environment is constant
Fill in the blank(s) with correct word