Is there only one way to conduct a scientific experiment? Why or why not

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

What was the land like over 500 million years ago? what was under the sea?

What amino acid is coded for by this sequence after the mutation