Answer the following question given this paragraph: Single-celled organisms do not need blood. They obtain nutrients directly from and excrete wastes directly into their environment. The human organism cannot do that. Our large, complex bodies need blood to deliver nutrients to and remove wastes from our trillions of cells. The heart pumps blood throughout the body in a network of blood vessels. Together, these three componentsblood, heart, and vesselsmakes up the cardiovascular system. This chapter focuses on the medium of transport: blood. Q: What type of organisms do not need blood? A:

OPTIONS:
- cold-blooded
- vertebrate
- marine
- single-celled

Answer: single-celled

Answer the following question given this paragraph: Many animal behaviors occur in repeated cycles. Migration and hibernation are examples of behaviors with annual cycles. Sleeping and waking are examples of behaviors with daily cycles. Q: Migration and hibernation are examples of behaviors that occur on what temporal basis? A:

OPTIONS:
- nocturnal
- weekly
- daily
- annual

Answer: annual

Answer the following question given this paragraph: An example of a human polygenic trait is adult height. Several genes, each with more than one allele, contribute to this trait, so there are many possible adult heights. For example, one adult's height might be 1.655 m (5.430 feet), and another adult's height might be 1.656 m (5.433 feet) tall. Adult height ranges from less than 5 feet to more than 6 feet, but the majority of people fall near the middle of the range, as shown in Figure below . Q: Because several genes, each with more than one allele, contribute to determining height in humans, height is considered what kind of trait? A:

OPTIONS:
- adaptive
- maladaptive
- epigenetic
- polygenic

Answer: polygenic

Answer the following question given this paragraph: The plasma membrane may have extensions, such as whip-like flagella or brush-like cilia . In single-celled organisms, like those shown in Figure below , the membrane extensions may help the organisms move. In multicellular organisms, the extensions have other functions. For example, the cilia on human lung cells sweep foreign particles and mucus toward the mouth and nose. Q: In single-celled organisms, what does the plasma membrane extensions help the organisms to do? A:

OPTIONS:
- increase
- inspect
- prevent
- move

Answer:
move