The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas, suggests that
a) ecosystems are interconnected and human action can alter ecosystem equilibrium
b) recycling programs have failed to conserve biotic resources
c) natural processes can alter ecosystem stability
d) direct harvesting practices have led to irreversible destruction of ecosystems

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.

Aplant has an egg with 34 chromosomes how many chromosomes does a leaf cell of that plant have

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them