An old iron battery was discarded in this meadow. as time passes, the iron begins to undergo a chemical change when the iron reacts with the oxygen in the air. the evidence that a chemical change has occurred in this example is that a) rusting releases a gas. b) rusting produces water. c) rusting produces a new substance. d) none of these changes are occurring. i need a correct answer plz!

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Select all the correct answers. which statements fail to meet the requirements of a scientific claim? a). in the final 100 meters of a 10,000-meter race, an athlete's speed is more strongly related to anaerobic efficiency than to aerobic efficiency. b). flowers that reflect the most ultraviolet light are more likely to attract bees and other pollinators than flowers that reflect less ultraviolet light. c). the evidence supporting newton's laws of motion was accurate in newton's time, but the universe operates differently today. d). even though evidence indicates that the solar system's planets follow elliptical paths, copernicus's model involving circular orbits is true.

How fast is a cheetah compared to a hyena?