Which is responsible for the current increase in carbon in the atmosphere?
Question 1 options:

a)Photosynthesis

B)Cellular Respiration

C)Burning Fossil Fuel

D)Decomposition

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

Which kind of worm has a closed circulatory system? a planarian b fluke c pinworm d an earthworm

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)