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

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

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Which of the following best describes the formation of plasma?

Which statement correctly identifies the scientific question and describes why the question is scientific? question 1 refers to the supernatural.question 2 reflects a moral or social value.question 3 refers to something that can be measured.question 4 reflects a question that can’t be observed.