Two or more "jobs" that must occur
inside of our body so that we stay alive.

Every second of every day, blood delivers vital nutrients, oxygen, and other chemicals to all of your organs. It also carts away your body's waste. They coat germs, making it possible for white blood cells in the bloodstream to kill them. However, the very liquid that keeps you alive can also kill you.

Explanation:

Hope this helps

humans, along with other animals and plants, have linear chromosomes that are arranged in pairs within the nucleus of the cell. the only human cells that do not contain pairs of chromosomes are reproductive cells, or gametes, which carry just one copy of each chromosome.

1. (1.2kw)x(15/60hours) = .3kwh --> a

2. (5kw)x(90/60hours)x(8cents/kwh) = $0.60 --> d

3. microwave --> 1200 watts = (1.2kw)x(6/60hours) = .12kwh

coffee-maker --> 900 watts = (.9kw)x(10/60hours) = .15kwh

therefore, it requires more energy for the coffee-maker to do the same amount of work.

so the answer is a.