Whats a cell wall? explain in detail

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?

Which are reasons cells undergo cell division?

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