Which best describes the different features of plant life cycles?
a) a spore is a diploid cell that is produced by mitosis
b) a zygote is a diploid cell that is produced by fertilization
c) a zygote is a haploid cell that is produced by meiosis

How do cells grow and reproduce to maintain homeostasis?

Qué sucede cuando una persona tiene muy poco o demasiado costeroides?

1. in what ways have non-native species been beneficial? 2. what are some of the hypotheses for the collapse of honeybee colonies? 3. distinguish between regional and functional extinction. 4. why is it difficult to measure background extinction rates? 5. what three factors are most important in causing extinction rates to climb?