PREZYGOTIC isolating mechanisms ensure that: * no mating has occurred (sperm is not able to fertilize the egg)

hybrids are not fertile

hybrids are more likely to survive

genes do not mutate and affect the entire population

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material

Were you able to observe the nucleolus in any of the cells if so which ones

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give