Answer:
Microorganisms have adapted to inhabit almost every corner of the world. They live in the oceans and lakes, where they provide a valuable food source for larger organisms. They live on land where they may the decay of dead organic material, recycling valuable nutrients. ... Many microorganisms cause disease in humans.
The clouds drifting across the sky RESEMBLE a distant flock of pale birds.
And. Is thE best answer because it just makes since
Yes, I believe D is correct. That topic sentence seems to be the only one, out of the other options, to address everything in the paragraph.