Yes, as scientists could figure out what might have changed in the variables she used. Brainliest me and I can give you the whole system.
Ok here we go:
Science starts with observing which leads to hypothesis, which is tested by experiments.
The other two i am not sure of. Hope i was a help to you. One thing you can do to figure out the other two is google: "what type of science includes medicine and envirnmental science", and do the same for the other one.
Answer: D. Extinctions occur at higher rates during times of ecological stress when populations and species are poorly adapted.
The kingdoms that include both unicellular & multicellular are protist & fungi
