All substances have characteristic properties. if one of these properties can be observed without changing the identity of the substance, it must be a

Physical property

Explanation:

Physical properties are specific properties of a given matter. They are those that can be observed when there is mechanical or heat action (thermal energy). These properties can be observed or measured without changing the identity of the substance.

For example, if we take a sample of water from a particular mass, we do not change its constitution, so the mass is a physical property. Another example is the property that water has to evaporate, it changes from a liquid to a vapor state, but remains with the same chemical composition. Thus, the boiling point is a physical property.

Other examples of physical properties are: volume, density, physical state (solid, liquid and gas), melting point, temperature, color and hardness.

a. suckling by young

b. hypothalamus

c. dopamine

d. trh

e. anterior pituitary

f. mammary glands

g. milk production