I am going to go with steroids because they are a type of lipid.
Answer:
Before the industrial revolution, there wasn't much pollution/soot, and the moths were mostly light colored. When humans started using machines for everything, soot coated the trees and the light colored moths were easier for birds (predators) to see. The moths became mostly dark colored, because it was better camoflauge.
Now that we have environmental restrictions, there isn't as much soot everywhere. Now moths are mostly light colored again, because the dark moths are easier to see.
It is the third one because the quiet rattle snakes are better adapted to their environment than the ones that rattle. So the ones that rattle ,which aren’t adapted to their environment, die off.
Answer:
D. Microglia
Explanation:
Microglia are phagocytic, which means that they are cells that can engulf other cells and particles. Microglia protect the CNS by engulfing foreign particles and bacteria. They act also as a clean-up crew that help remove dead cells. They are found in both the brain and spinal cord, which make up the Central Nervous System, or the CNS.
As you can see in the pedigree presented below, the allele that enables the adaptation for living in high altitudes is recessive, meaning that two copies of this allele are necessary in order for the individual to possess this trait.