1. both carbon dioxide and water are pure substances. how are they simular to each other? (a) both substances have a set ratioof atomsthat cannot be separated by physical means. (b) both substances have a set ratio of atoms that can be separated by physical means. (c) both substances have the same physical and chemical properties. (d) both substances have the same physical properties, but different chemical properties.

The answer is pure substances, by definition, are made of only one kind of atom/molecule, and cannot be broken down. Thus, their atoms cannot be separated.

Carbon dioxide is a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

this is true, assuming that the allele is completely recessive and incomplete dominance is not a factor.