Answer:
<u>Mass</u>
measures in kg
does not change when gravity changes
amount of matter
<u>Weight</u>
measures in Newtons
changes when gravity changes
gravitational force
Energy flows up a food chain, from the primary producers to the primary consumers, to the secondary consumers, up to the tertiary and then quaternary consumers. Energy flows when one organism eats another lower in the food chain, the energy is transferred by heat and movement, some though is lost. They eat each other but it only gets half the energy stored. A food web is similar - it is just a series of food chains.
It's A, because it's always important to drink water. If you think about it, all the other answers seem invalid.
cohesion is a major property of water
