Asap pls what is the second step in the classification of living things?

Why do we perceive objects as retaining their brightness under different lighting levels?

If your blood becomes too concentrated with iona, what will happen to the red blood cells

Where is having brightly colored feathers that attract mates most clearly an adaptation for a bird? a. a forest with dense vegetation b. a sandy beach beside an ocean c. a snowy tundra with little vegetation d. a swamp with many hawks that eat birds