Explain why a pool at the beginning of summer may be warm for the first couple feet, but then cold.

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

2points what is the term for a female reproductive cell? a. egg b. chromatid c. allele d. fertilization

Which of the following occurs after a natural or unnatural disturbance in an ecosystem