How can scientists know for sure that the cell theory is true? what evidence do we have to prove it?

Of the 168 hours in a week as a full time student you should spend how many hours per week on school work?

Explain how you might determine the rate of weathering on a sample rock

In an ecosystem, marsh snails feed on phytoplankton and painted turtles feed on marsh snails. pollution has resulted in the depletion of phytoplankton. what effect would this situation likely have on the population of marsh snails and painted turtles? as phytoplankton were destroyed, the population of marsh snails would most likely then the population of painted turtles would mostly likely a. 1. increase 2. decrease 3. stay the same b. 1. increase 2. decrease 3. stay the same