NIMI 2
3
4
A team of scientists is studying the fossils in the cross-section of rock shown below. Between which two layer of fossils can
secondary succession be observed?
A
Layers 1 and 2
B)
Layers 2 and 3
C
Layers 3 and 4
D
Layers 1 and 4

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

cells spend most of their time in interphase