Question

please help brother and sister ​

Answer 1

Answer:

the substance which taste is sour

respiration is the movement of oxygen from the outside environment to the cells within tissues, and the transport of carbon dioxide in the opposite direction.

Chemical indicator, any substance that gives a visible sign

the degree of hotness

Answer 2

Acid = a substance with particular chemical properties including turning litmus red ,Netaruslalizing akalis ,and dissvoles some metals

Temperature= the degree of internal heat of a person’s body

Hope it's help you