Answer the following question given this paragraph: Absorption is the process that allows substances you eat to be taken up by the blood. After food is broken down into small nutrient molecules, the molecules are absorbed by the blood. After absorption, the nutrient molecules travel in the bloodstream to cells throughout the body. This happens mostly in the small intestine. Q: What is the process by which the substances you consume are taken up by the blood? Choices: - evaporation - filtration - digestion - absorption A:
absorption
Answer the following question given this paragraph: Figure 38.4 The skeletons of humans and horses are examples of endoskeletons. (credit: Ross Murphy). Q: The skeletons of humans and horses are examples of what? Choices: - pliant skeletons - exoskeletons - hydroskeleton - endoskeletons A:
endoskeletons
Q: Answer the following question given this paragraph: Sexual reproduction happens when a sperm and an egg cell combine together. This is called fertilization . Sperm are released into the vagina during sexual intercourse. They "swim" through the uterus and enter a fallopian tube . This is where fertilization normally takes place. Q: What happens when a sperm and an egg cell combine? Choices: - migration - manipulation - stimulation - fertilization A:
A: fertilization
Question: Answer the following question given this paragraph: Cations have positive charges, and anions have negative charges. Q: Cations have what type of charge? Choices: - negative - neutral - constant - positive A:
Answer: positive
*Question*
Answer the following question given this paragraph: 23.4 Natural selection is the only mechanism that consistently causes adaptive evolution. Q: What is the only mechanism that consistently causes adaptive evolution? Choices: - genetic drift - neutral selection - artificial selection - natural selection A:
**Answer**
natural selection
*Question*
Answer the following question given this paragraph: Q: What is the key to the demographic transition? Choices: - higher birth rates - higher expatriation - higher death rates - reduced family size A:
**Answer**
reduced family size