B. Chloroplast
A chloroplast is an organelle found in the cells of green plants, it basically turns the plants green, animals do not have chloroplasts.
Answer:
Gives us energy by providing energy to the cells inside our body. Carbohydrates in food are used first. When they are all used up, the body then uses fats, and then proteins as energy sources.
b) some bacteria reduce nitrate ion
Answer:
Option A is correct.
A. Density.
<h3>Explanation:</h3>
Physical properties are those that can be observed without changing the identity of the substance. The general properties of matter such as color, density, hardness, are examples of physical properties. Flammability and corrosion/oxidation resistance are examples of chemical properties.