Answer the following question given this paragraph: Q: In the freshwater flatworms, protonephridia serve chiefly in what? Choices: - enculturation - excretion - thermoregulation - osmoregulation A:
osmoregulation
(Question)
Answer the following question given this paragraph: Wild plants and animals maintain a valuable pool of genetic variation . This is important because domestic species are genetically uniform. This puts them at great risk of dying out due to disease. Q: Unlike wild animals, what type of species are genetically uniform, making them more vulnerable to die-out from disease? Choices: - free-range species - urbane species - mammals - domestic species A:
(Answer)
domestic species
Ques: Answer the following question given this paragraph: system of glands that secrete chemical messenger molecules called hormones into the blood. Q: A system of glands secretes what chemical messenger molecules into the blood? Choices: - metabolytes - enzymes - acids - hormones A:
Ans: hormones
(Q).
Answer the following question given this paragraph: The use of nuclear fusion for energy has several pros. Unlike nuclear fission, which involves dangerous radioisotopes, nuclear fusion involves hydrogen and helium. These elements are harmless. Hydrogen is also very plentiful. There is a huge amount of hydrogen in ocean water. The hydrogen in just a gallon of water could produce as much energy by nuclear fusion as burning 1,140 liters (300 gallons) of gasoline! The hydrogen in the oceans would generate enough energy to supply all the world's people for a very long time. Q: Unlike nuclear fission, which involves dangerous radioisotopes, nuclear fusion involves what two harmless elements? Choices: - magnesium and helium - hydrogen and oxygen - hydrogen and carbon - hydrogen and helium A:
(A).
hydrogen and helium
Ques:Answer the following question given this paragraph: Muscle fibers are made mostly of protein. Q: What type of fibers are made mostly of protein in living things? Choices: - organ fibers - liver fibers - connective tissue fibers - muscle fibers A:

Ans:muscle fibers
Ques: Answer the following question given this paragraph: There are four major forces of evolution that cause allele frequencies to change. They are mutation, gene flow, genetic drift, and natural selection. Q: How many major forces of elevation cause allele frequencies to change? Choices: - one - five - three - four A:
Ans:
four