What organism is primarily responsible for nitrogen fixation

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

What is the approximate time of death of the body temperature is 29.4 degrees celsius

Which organelle breaks down sugar molecules that supply energy to the cell ?