In the cell cycle, external regulators direct cells to

• A. speed up or slow down the cycle

• B. Remain unchanged

• C. Proceed and then stop the cycle

• D. Grow uncontrollably

Agriculturists have developed some varieties of vegetables from common wild mustard plants, which reproduce sexually. Which statement best explains the development of these different varieties of vegetables? a.

What do all cell activities in living organisms use as a. source of energy?

Why is it rare for the soft part of an organism to become a fossil?

Which one of these productive methods is the only one available to mosses and ferns 1. Sperms 2. Spores 3. Eggs 4. Seeds

What would happen to a plant if the chloroplasts were unable to carry out their function

What macromolecule is the primary energy source for organisms?

What is the difference between diploid and haploid cells?

The function of a neuron is to

Can a molecule may contain two atoms of the same element

What are the warning signs of COPD?