Blood donations to the red cross are considered products.

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.

What is the next step in muscle contraction after the actin changes shape? (apex)

Anormal strand of dna is shown below, followed by the same strand of dna after mutations have occurred.