Answer:
B
Explanation:
It removes other waste from our body and keeps our blood clean
C. Channel proteins bind to molecules too large to diffuse into or out of the cell, and allow them to pass.
Answer:
Ecological and ethological approaches to the study of behaviour. The natural history approach of Darwin and his predecessors gradually evolved into the twin sciences of animal ecology, the study of the interactions between an animal and its environment, and ethology, the biological study of animal behaviour.
