What are the environmental conditions that plant and animal systems need to deal with, with regard to reproduction systems (i. e. why do they exist the way they do)? g?

When species lose their habitats they may..

The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2

Asap. this question is 100 points if you answer it question: describe the basic relationship between ocean depth and temperature seen in the graph