What affect do PCB’s have on Tomcod embryos?
a) PCB’s cause the pancreas to become toxic
b) PCB’s cause the heart to be smaller and not beat properly
c) PCB’s cause the liver to break down leading to death
d) PCB’s cause brain to swell

What is the main function of the central vacuole in a plant cell? a. absorbs energy from the sun to produce food b. holds water and maintains turgor pressure c. breaks down molecules to release energy d. contains the cell's genetic material