the endosymbiotic theory explains how eukaryotic cells may have evolved from prokaryotic cells. which two organelles are said to have been engulfed by this primitive prokaryotic, thereby creating eukaryotic cell

Environmental differences within ecosystems are generally caused by

Biology ! the conversion of inorganic carbon to organic carbon by plants during photosynthesis is known as _[blank]_. filtration immigration reabsorption primary production

Once an egg cell is fertilized by sperm, the cell then, as the embryo develops, it receives nourishment and eliminates wastes by transferring substances from its blood to its mother's blood. a. becomes a fetus immediately and exits the womb b. begins to divide and implants itself in the wall of the uterus c. remains in the uterus without dividing for several months d. travels back to the ovaries until the fetus is developed