Answer:
Blood is carried away from the heart by arteries. Blood that is rich in oxygen. Blood that is low in oxygen is returned to the heart by veins. there is more pressure in arteries than in veins.
Answer:
it illustrated natural selection because the most favorable traits live longer than the unfavorable traits.
Explanation:
The genes involved in pattern formation and organization of body parts are called homeobox genes, which are a large family of similar genes.
The h<span>omeobox genes direct the formation of many body structures during early development of the embryo. </span>
If the producer were to disappear then all the other organisms will either go extinct, survival of the fittest, or have to adapt to the change.