Q: Most bacteria may be placed into one of three groups based on their response to gaseous? Choices: - potassium - nitrogen - carbon - oxygen A:
oxygen

(Question)
Q: What type of barrier physically blocks pathogens from entering the body? Choices: - Solid - potential - molecular - mechanical A:
(Answer)
mechanical

Ques: Q: How many atoms of oxygen does silicon dioxide contain? Choices: - three - six - one - two A:
Ans: two

(Q).
Q: The idea of evolution has been around for centuries. in fact, it goes all the way back to the ancient greek philosopher named? Choices: - Xerxes - Pluto - Galileo - aristotle A:
(A).
aristotle

Ques:Q: Each megasporangium has a single functional one of what? Choices: - antispore - spicule - cocklebur - megaspore A:

Ans:megaspore

Q: Sympatric type of what occurs when a single population of organisms splits into two reproductively isolated communities within the same physical region? Choices: - biodiversity - extraction - accumulation - speciation A:
speciation