Which of these events happens first in earth's polar regions?
a. the dense water sinks.
c. water molecules move closer together.
b. the water travels as a deep current.
d. cold air chills water molecules.

Explain the importance of producers, primary consumers, secondary consumers. and decomposers in an ecosystem

Select the correct answer.which scenario describes unethical lab behavior? o a. danny stores the chemicals required for his experiment in flasks and beakers.b.anna publishes the results of her experiment on the growth rate of saplings.c.jason repeatedly runs an experiment until he gets the results he desires.d. mia records her observations of an experiment precisely and accurately.

In what for do plants utilize nitrogen? why do they need nitrogen?