41.4 Qut: Evidence for Evolution 7
2
Which two layers are most likely to contain fossils that are the closest in
terms of structure and age?
A. Layers 4 and 6
B. Layers 8 and 9
C. Layers 6 and 9
D. Layers 1 and 9
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not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.