What organ system are you talking about
Answer:
The two major proteins, actin and myosin, appear in muscle cells
Explanation:
Plants get nitrogen from there roots then when the consumers eat the plant the nitrogen gets passed to them
Answer: Similarity
Explanation:
The similarity among the individuals can be defined as the principle in which the organism or object are separated based on criteria.
The criteria can be color, feature, similar process, et cetera. Here, the birds are separated based on the character of similarity on cardinal.
The similarity here is in the cardinal color of the bird. One of the cardinal color of birds is red and the other one is brown.