Khan Academy is great! Also, Alison (it's a website) has some free courses as well.
Answer: Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.
Explanation:
Answer:
B
Explanation:
As the moon rotates around the Earth the angle of light given off from the sun changes.
The transmission of antibiotic resistance, toxicity, and allergenicity are all known to be major health risks associated with GM foods.
