An iron rod has a known mass. measuring a change in its height over time allows determination of change in which form of energy in the rod?

a
electric
b
kinetic
c
chemical
d
gravitational potential

C: Chemical

Explanation:

Chemical changes and their accompanying changes in energy are important parts of our everyday world (Figure  6.1.1 ). The macronutrients in food (proteins, fats, and carbohydrates) undergo metabolic reactions that provide the energy to keep our bodies functioning. We burn a variety of fuels (gasoline, natural gas, coal) to produce energy for transportation, heating, and the generation of electricity. Industrial chemical reactions use enormous amounts of energy to produce raw materials (such as iron and aluminum). Energy is then used to manufacture those raw materials into useful products, such as cars, skyscrapers, and bridges.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.