Q: During the early paleozoic, the amount of carbon dioxide in the atmosphere compared to today was? Choices: - none - the same - much lower - much greater A:
much greater

(Question)
Q: The esophagus runs a mainly straight route through the mediastinum of what? Choices: - liver - lungs - stomach - thorax A:
(Answer)
thorax

Ques: Q: As the population grows, competition for food does what? Choices: - stays the same - decreases - stagnates - grows A:
Ans: grows

(Q).
Q: Where do angiosperms produce seeds in flowers? Choices: - germs - cones - testes - ovaries A:
(A).
ovaries

Ques:Q: Representing a leap in scientific understanding, einstein described what as a dent in the fabric of space and time? Choices: - motion - light - energy - gravity A:

Ans:gravity

Q: What type of physics explains the behavior of visible light and electromagnetic waves? Choices: - Quantum mechanics - Thermodynamics - statistics - optics A:
optics