Q: What are variants of genes called? Choices: - antigens - mutations - allergens - alleles A:
alleles

Q: What 2 things keep polar bears warm in their arctic ecosystem? Choices: - hibernation, thick fur - colourful fur , blubber - camouflage, blubber - thick fur, blubber A:
thick fur, blubber

Q: Q: Plants can lose their leaves, flower, or break dormancy in response to a change in what? Choices: - events - periods - averages - seasons A:
A: seasons

Question: Q: What part of a plant, which is attached to its stem nodes, is the "main organ" of photosynthesis? Choices: - flowers - roots - spores - leaves A:
Answer: leaves

*Question*
Q: The three main rock types are igneous, metamorphic, and what? Choices: - basalt - crystalline - silicate - sedimentary A:
**Answer**
sedimentary

*Question*
Q: What term means the percentage by mass of each element in a compound? Choices: - mass effect - elemental percent - biomass - percent composition A:
**Answer**
percent composition