Scientists can measure gene expression in firefly genes using plants. To measure the gene expression, the firefly gene must be attached to the plant
gene that scientists want to study. Then, when the plant gene is
actively expressing itself, such as when a new leaf forms, the firefly gene
simply lights up. The light can be detected and measured by a number of
devices. How is it possible that plants can express firefly genes?

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

human-caused climate hope this

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms