- Life Sciences
double-membraned, pigmented, cytoplasmic organelles found in plant cells. The organelles have various physiological functions, such as the synthesis and storage of various substances.
the protective layer of fibrous connective tissue which surrounds each kidney.
a physical and psychological dependence on alcohol, which affects every aspect of a person's...
a kingdom of very small, single-celled organisms without a nucleus. They reproduce asexually by...