What causes the earth’s magnetic field?
a.
the mineral composition of the earth’s crust
b.
magnetic particles located at the earth’s poles
c.
molten material in the mantle
d.
currents in the earth’s liquid-metal outer core

Compare and contrast your sells take in oxygen, water, and food. what is one waste product that leaves your cells?

You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food. a) carbohydrates b) lipids (fats) c) proteins d) sugars

To take a whiff of your favorite food, you use both? a. motor nerves and your digestive system b. sensory nerves and your immune system c. motor nerves and your skeletal system d. sensory nerves and your respiratory system