- Life Sciences
a chemical substance found in food that is essential for maintaining life.
animals with two cellular body wall layers: the ectoderm and endoderm.
outer body tissue layer that forms the epithelium and nervous tissue.
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
double-membraned, pigmented, cytoplasmic organelles found in plant cells. The organelles have...