Ques: Q: What is the only way to completely avoid stis? Choices: - cover your mouth - oral sex - contraceptive use - avoid sexual contact A:
Ans: avoid sexual contact

Ques: Q: What consists of thylakoid membranes surrounded by stroma? Choices: - a photon - a nucleus - a stem - a chloroplast A:
Ans: a chloroplast

Ques: Q: The light reactions take place in which membranes? Choices: - the cell membranes - the phospholipid - the stroma - the thylakoid A:
Ans: the thylakoid

Ques: Q: Most food chains and webs have a maximum of how many trophic levels? Choices: - 3 - 10 - 6 - 4 A:
Ans:
4