Answer:
abiogenesis
Explanation:
a (not) biogenesis (coming from other life forms)
Biogenesis would mean that it's coming from other life forms,
Natural selection is a part of evolution (what is there to select?)
Variation is also a part of evolution (not related)
Answer:
The Sun
Explanation:
it is essential to doing photosynthesis
It's known as severity.
The fact that her pain is on the scale between 1-10 refers to the severity of her pain.
Hope that helped ^U^
Stage 3 because the person fev1 level is go down not up