Q: Competition with what emerging animal group may have led to extinction of cynodonts about 200 million years ago? Choices: - reptiles - amphibians - insects - mammals A:
mammals

(Question)
Q: The development of multi-cellular organisms begins from a single-celled zygote, which undergoes rapid cell division to form this? Choices: - gametophyte - multicell - eukaryote - blastula A:
(Answer)
blastula

Ques: Q: Ecosystem dynamics include more than the flow of energy and recycling of matter. ecosystems are also dynamic because they? Choices: - stay the same - recreate exactly alike - never move - change through time A:
Ans: change through time

(Q).
Q: What is the term for the tube that carries sound waves into the ear? Choices: - sound canal - flap canal - tone canal - ear canal A:
(A).
ear canal

Ques:Q: What disease associated with smoking involves breakdown of walls of the alveoli, resulting in less gas exchange by the lungs? Choices: - leukemia - cancer - pneumonia - emphysema A:

Ans:emphysema

Ques:Q: What is the process of changing something from a gas to a liquid? Choices: - sublimation - combustion - fermentation - condensation A:

Ans:
condensation