Cold water holds more dissolved gas than warm water. Cold water also tends to collect in the lower levels of a lake.
However, in summer, oxygen levels in a lake can be highest
in the warm surface water of a lake. Explain why.

Which is a function of the central nervous system

Earth is tilted on its axis. which of these would not exist if earth had no tilt?

Cancer cells spread to other parts of the body by entering the bloodstream. which of the following organs could prevent a cancer cell in the bloodstream from spreading, and why? a. the spleen, because it releases lymphocytes into the blood b. the peyer's patches, because they release lymphocytes into the blood c. the lymph nodes, because they release lymph into the blood d. the thymus, because it releases lymph into the blood