Which is the primary consumer in this food chain? rabbit grass snake hawk?

The correct answer would be a rabbit.

Primary consumers refer to the organisms which feed on autotrophs or green plants or primary producers.

They are present at the second trophic level and are usually herbivores in nature.

For example, the rabbit is herbivores in nature which usually feeds on fresh fruits and vegetables.

Thus, the rabbit would be the primary consumer among the given organisms.

answer: b

coz red blood cells marrow and circulates the body for 120 days.