What is an excellent food source for the mineral calcium?
a. legumes
b. dairy products
c. sodas
d. breads e. meats

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

If 1.63 times 10 negative 4 of helium dissolves in 100.0g of water, what is the concentration in parts per million

What is driving behind plate tectonics (plate movment)? a) gravity only b) inertia c) convection and gravity d) the sun theres no option for science so i picked chemistry. plz