Which microscope did anton van leeuwenhoek use to observe single-celled organisms?
a) simple microscope
b) compound light microscope
c) electron microscope
d) tunneling microscope

Which process is involved in growing crops? irrigation transportation recreation condensation

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

As a result of these processes the single celled organism accomplishes