Which of the following must happen first if natural selection is going to take place? 1. variation in organisms 2. selective advantage of one trait over another 3. reproduction 4. time 5. generic mutation

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Mike has a problem with his testosterone. he is unable to produce enough. which will most likely be affected by his inability to produce testosterone? check all that apply.

Amap's orientation is typically determined by an