What are the products of photosynthesis? (5 Points glucose and oxygen glucose and carbon dioxide carbon dioxide and ATP ​

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Ineed to know why d is the correct answer asap

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?