An important species of the Chesapeake Bay community is the Virginia oyster. The larvae of these oysters settle on top of mature oysters, forming large oyster reefs. Oyster reefs allow small fishes to avoid predators and provide shelter for a variety of marine invertebrates. Which of the following best describes the role of Virginia oysters in the Chesapeake Bay?

A. a pioneer species

B. a foundation species

C. an invasive species

D. a dominant species

scientists have discovered that hiv does not cause aids by the virus's direct effect on the host's immune cells, but rather through the cells' lethal influence on one another. researchers from the gladstone institutes have revealed that hiv does not cause aids by the virus's

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.