Question: Choose your answer.

Which of the following best describes a change in Earth's atmosphere made by early photosynthetic life?
My Answer: increased level of oxygen

Question: Choose your answer.

A bird has just hatched from an egg. Which of the following stages most likely comes next in the life cycle of the bird?
My Answer: growth

Question: Choose your answer.

Which question can most likely be determined through a scientific investigation?
My Answer: What is the amount of light needed to grow tomatoes?

Question: Choose your answer.

Which of these soil changes is due only to natural causes?
My Answer:
Minerals washing out due to heavy rain.