Ques: Answer the following question given this paragraph: Q: Composed largely of the polysaccharide chitin, the exoskeleton provides an effective barrier defense against most what? Choices: - parasites - white blood cells - vaccines - pathogens A:
Ans: pathogens

Ques: Answer the following question given this paragraph: Unlike males, females are not influenced by the male sex hormone testosterone during embryonic development. This is because they lack a Y chromosome. As a result, females do not develop male reproductive organs. By the third month of fetal development, most of the internal female organs have formed. Immature eggs also form in the ovary before birth. Whereas a mature male produces sperm throughout his life, a female produces all the eggs she will ever make before birth. Q: Females are not influenced by the male sex hormone testosterone during embryonic development because they lack what? Choices: - x chromosome - m chromosome - z chromosome - y chromosome A:
Ans: y chromosome

Ques: Answer the following question given this paragraph: A Geiger counter provides a sensitive means of detecting radioactivity. A tube is filled with an inert gas, which will conduct electricity when radiation enters it. When a charged particle comes into the tube, it changes the electrical potential between the anode and the cathode. This change in potential in the tube produces a change in voltage in the electrical circuit and registers as a count. Geiger counters are fairly inexpensive and reliable, so they are useful in a wide range of applications. More complicated types of counters are also available, but are generally used in sophisticated experiments. Q: What counter provides a sensitive means of detecting radioactivity? Choices: - calorie - bouncy - gravity - geiger A:
Ans: geiger

Ques: Answer the following question given this paragraph: Biomass is the material that comes from plants and animals that were recently living. Biomass can be burned directly. This happens when you burn a log in your fireplace. For as long as humans have had fire, people have used biomass for heating and cooking. Q: What is the organic material that comes from plants and animals that were recently living called? Choices: - biofuels - contaminants - chlorophyll - biomass A:
Ans:
biomass