Which statement best describes an important process carried out by structure X?
1. Milk passes from the mother to the fetus.
2. Materials are exchanged between fetal and maternal blood.
3. Maternal blood is converted into fetal blood.
4. Oxygen diffuses from fetal blood to maternal blood.

What are four key elements of the study of economics?

Sand spinifex grass is adapted to growing on sand dunes. it is a rapidly spreading plant and the creeping runners produce new root systems. which of these best explains the benefits of these features? a. it limits water loss through the leaves. b. it provides support by anchoring the plant. c. it protects the plant from predators. d. it allows the plant to tolerate salt. reset submit

What would happen to the nutrients in an ecosystem if decomposers, such as bacteria, didn’t exist there?