The semi fluid matrix that surrounds organelles
in a cell is called the cytoplasm.<span> <span>Organelles are the specialized structure with in a cell. Some
biologist says that organelle is a cell compartment. Mitochondria and
plastids are two broad classes of organelles. Cytoplasm is a thick substance
which fills each cell.</span></span>
B - When many individuals of the same species are available for mating. And C - When the individuals live in a stable environment in which they thrive.
