What type of variation is necessary for natural selection to occur

artificial variation

Environmental variation

Genetic variation

Neutral variation

Farmers spray pesticides to protect fruits from pests. What is a possible harmful effect of using pesticides? A) Pesticides are harmful to plants and should not be used. B) Pesticides collect on the leaves and do not allow plants to take in oxygen.

Which term is related to mitosis?

How does the structure of animal cells allow animals to move?

Mechanical forces that produce tissue trauma would be classified as which type of cellular injury?

Read this excerpt from Holes. At the time, Elya thought nothing of the curse. He was just a fifteen-year-old kid, and "eternity" didn't seem much longer than a week from Tuesday.

Question 18 Which term best describes the diagram below? Eye color Blood type . Hair color Growth

Why did mendels use characteristics that only had 2 options? how did this aid in the development of his theories?

8. Modern fishing practices threaten biodiversity mainly through the

What is transpiration, and how does it occur within a plant

Describe each of the four mechanisms that cause air to rise.