Which layer of earth's atmosphere contains the ozone layer, an important layer that protect life on earth from uv radiation. a) exosphere b) mesosphere c) stratosphere d) troposphere

Assume that a student is given two different models of bacteria, with one model consisting of big bacteria and the other consisting of small bacteria. how can the student demonstate the theory of endosymbiosis using the models

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

If animal agriculture was eliminated, how much grain would become available for human consumption?