When blood flows into the right atrium of the heart from the body, it contains A)little oxygen and a lot of carbon dioxide
B)a lot of oxygen and little carbon dioxide
C)a lot of both oxygen and carbon dioxide
D)little of either oxygen and carbon dioxide

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Surrounded by microtubules, located near the nucleus. (don't try to google it) (give answer only if u know)

92 sathe best for the question 11. most animals and plants reproduce sexually. this means that dna is passed down to new organisms from two parental organisms. which of the following is a key advantage of sexual reproduction?