Ques: Q: Class bivalvia ("two shells") includes clams, oysters, mussels, scallops, and these? Read this paragraph and choose the correct option from the provided answers: Class Bivalvia ("two shells") includes clams, oysters, mussels, scallops, and geoducks. Members of this class are found in marine as well as freshwater habitats. As the name suggests, bivalves are enclosed in a pair of shells (valves are commonly called "shells") that are hinged at the dorsal end by shell ligaments as well as shell teeth (Figure 28.22). The overall morphology is laterally flattened, and the head region is poorly developed. Eyespots and statocysts may be absent in some species. Since these animals are suspension feeders, a radula is absent in this class of mollusks. Respiration is facilitated by a pair of ctenidia, whereas excretion and osmoregulation are brought about by a pair of nephridia. Bivalves often possess a large mantle cavity. In some species, the posterior edges of the mantle may fuse to form two siphons that serve to take in and exude water. Choices: - grendels - crabs - octopuss - geoducks A:
Ans: geoducks

Ques: Q: What is the third male reprodutive structure after the penis and testes? Read this paragraph and choose the correct option from the provided answers: Male reproductive structures include the penis, testes, and epididymis. Choices: - clitoris - scrotum - anus - epididymis A:
Ans: epididymis

Ques: Q: What term means controlling body temperature within a narrow range from the inside through biochemical or physical means? Read this paragraph and choose the correct option from the provided answers: Both mammals and birds evolved endothermy. Endothermy means controlling body temperature within a narrow range from the inside through biochemical or physical means. For example, on a cold day, an endotherm may produce more body heat by increasing its rate of metabolism. On a hot day, it may give off more heat by increasing blood flow to the surface of the body. That way, some of the heat can radiate into the air from the body's surface. Endothermy requires more energy (and food) than ectothermy. However, it allows the animal to stay active regardless of the temperature outside. You can learn more about how vertebrates regulate their temperature by watching this video: https://www. youtube. com/watch?v=TSUCdLkI474 . Choices: - exothermy - regulation - evaporation - endothermy A:
Ans: endothermy

Ques: Q: What gas produced by fossil fuel use is a major cause of global warming? Read this paragraph and choose the correct option from the provided answers: When fossil fuels burn, they release thermal energy, water vapor, and carbon dioxide. Carbon dioxide produced by fossil fuel use is a major cause of global warming. The burning of fossil fuels also releases many pollutants into the air. Pollutants such as sulfur dioxide form acid rain, which kills living things and damages metals, stonework, and other materials. Pollutants such as nitrogen oxides cause smog, which is harmful to human health. Tiny particles, or particulates, released when fossil fuels burn also harm human health. Natural gas releases the least pollution; coal releases the most (see Figure below ). Petroleum has the additional risk of oil spills, which may seriously damage ecosystems. Choices: - helium - hydrogen - phosphorous - carbon dioxide A:
Ans:
carbon dioxide