Which process normally occurs at the placenta?
A. Oxygen diffuses from fetal blood to maternal blood.
B. Materials are exchanged between fetal and maternal blood.
C. Maternal blood is converted into fetal blood.
D. Digestive enzymes pass from maternal blood to fetal blood.
Answer: B. Materials are exchanged between fetal and maternal blood.
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A group of interbreeding individuals occupying the same habitat at the same time is a(n)
A. species. B. guild. C. population. D. equilibrium. E. quadrat.
Which of the following is not a characteristic of mammals?
A. They have a two-chambered heart. B. They have an amnion. C. They have a skeletal system composed of bone. D. They have lungs. E. They are endothermic.
The liver stores energy in the form of a polysaccharide called:
A) fiber B) starch C) glycogen D) glucose E) cellulose
Enzyme-filled vesicle in which fatty acids and amino acids are metabolized to hydrogen peroxide that is broken down to harmless products.
What will be an ideal response?