What are the 3 reactants for the tree in the image above?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

Consider the following reaction: 2h2 + o2 —> 2h2o a) what are the reactants in this reaction? b) what are the products in this reaction? c) how many molecules of oxygen are used in this reaction?

Agroup of students are walking in the park and one of them takes a picture of a pollen grain that is been blown by the wind what caption can the student use for this picture