Answer the following question given this paragraph: Recall that our DNA is wound into chromosomes . Each of our chromosomes contains a long chain of DNA that encodes hundreds, if not thousands, of genes. Each of these genes can have slightly different versions from individual to individual. These variants of genes are called alleles . Each parent only donates one allele for each gene to an offspring. Q: What are variants of genes called? Choices: - antigens - mutations - allergens - alleles A:
alleles
Answer the following question given this paragraph: Thick fur and a layer of blubber keep polar bears warm in their Arctic ecosystem. Why do you think their fur is white? Why might it be an adaptation in an Arctic biome?. 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: Answer the following question given this paragraph: Plants can respond to the change of season by losing their leaves, flowering, or breaking dormancy. 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: Answer the following question given this paragraph: 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*
Answer the following question given this paragraph: The three main rock types are igneous, metamorphic, and sedimentary. Q: The three main rock types are igneous, metamorphic, and what? Choices: - basalt - crystalline - silicate - sedimentary A:
**Answer**
sedimentary
*Question*
Answer the following question given this paragraph: Percent Composition The elemental makeup of a compound defines its chemical identity, and chemical formulas are the most succinct way of representing this elemental makeup. When a compound's formula is unknown, measuring the mass of each of its constituent elements is often the first step in the process of determining the formula experimentally. The results of these measurements permit the calculation of the compound's percent composition, defined as the percentage by mass of each element in the compound. For example, consider a gaseous compound composed solely of carbon and hydrogen. The percent composition of this compound could be represented as follows: mass H 100% mass compound mass C %C = 100% mass compound. 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