What is the difference between a haploid and a diploid?

What is the next step in muscle contraction after the actin changes shape? (apex)

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.