A team of scientists is studying the fossils in the cross-section of rock shown below. 2.
3
4
5
6
7
In which layers of rock are the oldest leaf and fish fossils found?
оа
Ob
layers 2 and 4
layers 1 and 3
layers 6 and 7
layers 3 and 7
с
Od

the backbone of the dna and rna compound is sugar phosphate.

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correct answer is a. and d.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: