Ques: 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: 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: Q: What counter provides a sensitive means of detecting radioactivity? Choices: - calorie - bouncy - gravity - geiger A:
Ans: geiger

Ques: 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