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They are where photosynthesis takes place, providing food for the plant. Chloroplasts contain chlorophyll pigment, which makes it green, which harvests the light needed for photosynthesis.

There is variation naturally present between members of a species. These variations can prove advantagous, thus making an individual in a species better adapted for survival. For example, giraffes with a lon...

Answer: A dead or inactive or weak form of pathogen is introduced. (Don't say Germ)This stimulates white cells / lymphocytes / leucocytes - B and T cells (not phagocytes)to produce antibodies. Antibodies are...

Glycoproteins can be antigens , enabling cell recognition of self and non-self cells. They also act as receptors for molecules such as hormones and drugs and pass on signals to intracellular components. Hydr...

Deoxygenated blood reaches the heart and enters into the right atrium. Pressure in the right atrium increases which causes the right atrioventricular valve to open allowing the passing of the blood into the ...