Answer the following question given this paragraph: Some resources can't be renewed. At least, they can't be renewed fast enough to keep up with use. Fossil fuels are an example. It takes millions of years for them to form. We are using them up much more quickly. Elements that are used to produce nuclear power are also non-renewable resources. Uranium, for example, which is rare. Sooner or later, it will run out. Q: Uranium is an example of a non-renewable resource used to produce what type of power? Choices: - water - wind - electrical - nuclear A:
nuclear
Answer the following question given this paragraph: Development of the Placenta During the first several weeks of development, the cells of the endometriumreferred to as decidual cellsnourish the nascent embryo. During prenatal weeks 412, the developing placenta gradually takes over the role of feeding the embryo, and the decidual cells are no longer needed. The mature placenta is composed of tissues derived from the embryo, as well as maternal tissues of the endometrium. The placenta connects to the conceptus via the umbilical cord, which carries deoxygenated blood and wastes from the fetus through two umbilical arteries; nutrients and oxygen are carried from the mother to the fetus through the single umbilical vein. The umbilical cord is surrounded by the amnion, and the spaces within the cord around the blood vessels are filled with Wharton's jelly, a mucous connective tissue. The maternal portion of the placenta develops from the deepest layer of the endometrium, the decidua basalis. To form the embryonic portion of the placenta, the syncytiotrophoblast and the underlying cells of the trophoblast (cytotrophoblast cells) begin to proliferate along with a layer of extraembryonic mesoderm cells. These form the chorionic membrane, which envelops the entire conceptus as the chorion. The chorionic membrane forms finger-like structures called chorionic villi that burrow into the endometrium like tree roots, making up the fetal portion of the placenta. The cytotrophoblast cells perforate the chorionic villi, burrow farther into the endometrium, and remodel maternal blood vessels to augment maternal blood flow surrounding the villi. Meanwhile, fetal mesenchymal cells derived from the mesoderm fill the villi and differentiate into blood vessels, including the three umbilical blood vessels that connect the embryo to the developing placenta (Figure 28.11). Q: During the first several weeks of development, the cells of the endometrium nourish what? Choices: - egg - nucleus - uterus - embryo A:
embryo
Q: Answer the following question given this paragraph: Besides water, most of the compounds in living things are biochemical compounds. A biochemical compound is a carbon-based compound that is found in living organisms. Carbon is an element that has a tremendous ability to form large compounds. Each atom of carbon can form four chemical bonds with other atoms. A chemical bond is the sharing of electrons between atoms. Bonds hold the atoms together in chemical compounds. A carbon atom can form bonds with other carbon atoms or with atoms of other elements. Q: What element is a biochemical compound based on? Choices: - hydrogen - nitrogen - oxygen - carbon A:
A: carbon
Question: Answer the following question given this paragraph: Muscle contraction occurs when muscle fibers get shorter. Literally, the muscle fibers get smaller in size. To understand how this happens, you need to know more about the structure of muscle fibers. Q: What occurs when muscle fibers get shorter? Choices: - muscle extension - muscle tension - muscle diffusion - muscle contraction A:
Answer: muscle contraction
*Question*
Answer the following question given this paragraph: Like bacteria, archaea can have flagella to assist with movement. Q: Like bacteria, archaea can have what to assist with movement? Choices: - cilia - antennae - sporangia - flagella A:
**Answer**
flagella
(Q).
Answer the following question given this paragraph: Topsoil has the highest proportion of organic material. Topsoil is essential for farming. Q: What layer of soil, essential for farming, has the highest proportion of organic material? Choices: - bedrock - humus - subsoil - topsoil A:
(A).
topsoil