What might cause the estimate of dandelions be wrong using the quadrat sample?

Calvin ate a candy bar, which caused his body's blood glucose levels to become unbalanced. his body responded by initiating a feedback mechanism to return his body to homeostasis. place the steps of this feedback mechanism in order, starting with the blood glucose imbalance that occurred after calvin consumed the candy bar. a) calvin's blood glucose levels decreased. b) calvin's pancreas stopped secreting insulin. c) calvin's body cells started to take up glucose and store it as glycogen. d) calvin's blood glucose levels increased. e) calvin's pancreas started secreting insulin.

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.