In what ways are the archaebacteria different than the eubacteria?

Explain how sequences of amino acids in proteins can be used to reveal relationships among organisms.

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

What is the difference between a meteoroid and a meteor?