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: Living organisms are comprised of organic compounds, which are molecules built around what element? Choices: - oxygen - silicon - helium - carbon A:
Ans: carbon

Ques: Q: The amniotic sac is attached to what? Choices: - Umbilical Cord - Stomach - uterus - placenta A:
Ans: placenta

Ques: Q: In which solution is the amount of dissolved material equal both inside and outside of the cell? Choices: - supersaturated - exothermic - hypotonic - isotonic A:
Ans:
isotonic