(Q).
Q: The polymerase chain reaction is a way of making copies of what? Choices: - an enzyme - a method - a form - a gene A:
(A).
a gene

(Q).
Q: If two chlorine atoms share their unpaired electrons by making a covalent bond and forming cl2, they can each complete their what? Choices: - hypothesized shell - radiative shell - electron shell - valence shell A:
(A).
valence shell

(Q).
Q: Terrestrial ecosystems, also known for their diversity, are grouped into large categories called what? Choices: - bisomes - monomes - substrates - biomes A:
(A).
biomes