Currently, Antarctica is the coldest and driest place on Earth. Paleontologists have found dinosaur fossils in rock layers below the ice. Based on this evidence, which is a reasonable conclusion about the climate of Antarctica in the past? OPTIONS:
- Antarctica has always had the same climate as at present.
- At some time in the past, Antarctica was a hot, dry desert.
- At some time in the past, Antarctica was much warmer and wetter.
- At some time in the past, Antarctica was colder and wetter than it is now.
A: At some time in the past, Antarctica was much warmer and wetter.

Which gas is given off by plants? OPTIONS:
- Hydrogen
- Nitrogen
- Oxygen
- Helium
A: Oxygen

An increase in phosphate levels in a lake increases the population of algae in the lake. Increased algae blocks sunlight into the lake and results in a decrease in dissolved oxygen in the lake's water. Which of the following should be expected as a result? OPTIONS:
- Plant populations in the lake increase.
- More predatory birds feed on lake animals.
- Phosphate levels in the lake decrease.
- Fish populations in the lake decline.
A: Fish populations in the lake decline.

Which phrase does not describe asexual reproduction in organisms? OPTIONS:
- requires two parents
- little variation in offspring
- only one type of cell involved
- duplicates its genetic material
A:
requires two parents