Which situation will most likely cause the sustainability of an ecosystem to weaken?

a- a zebra is killed and eaten by a lion.
b- a disease wipes out several plant species.
c- a frog lays hundreds of eggs that hatch into tadpoles.
d- a dry season causes a few small trees to die.

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

What would most likely happen if a person increased the amount of saturated fat in his or her diet? the person's risk of cardiovascular disease would increase. the person's risk of cardiovascular disease would decrease. the person's bad cholesterol would decrease. the person’s good cholesterol would increase.

An animal cell (left) and a plant cell (right) are shown.which organelle, labeled x in the diagram, is found in both plant and animal cells?