"its only a few drops," you may think as you spill something toxic on the ground. but those drop eventually add up. think about how many drops it would take to make a difference. what do you think would happen if someone spilled 4 l of oil into a lake?

Where can you find prokaryotic and eukaryotic cells?

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Ascientific idea becomes valid when it is what?