HIV directly attacks CD4 helper lymphocytes directly. (D)
Answer:
air and water
Explanation:
because those two are the only ones in this list that dont eat, breathe, or reproduce
Answer:
Terrestrial ecosystems are characterized by greater temperature fluctuations on both a diurnal and seasonal basis that occur in aquatic ecosystems in similar climates.
Explanation:
Answer: the tissue
Explanation:
Tissue is the beginning of a cell in the external human body
