Answer:
Volume= 4 cm³
Density= 2 g/cm³
Explanation:
We have the following data:
volume= V= 8 cm³
mass= m= 16 g
The density is the mass per volume of a substance, so the density of the rock is:
density= d= 16 g/8 cm³= 2 g/cm³
When we cut the rock in half, we have a half volume and a half mass:
V= 8 cm³/2= 4 cm³
m= 16 g/2= 8 g
But the density is not altered because it is an intrisic property - it does not change with the amount of subtance. Thus, the density of a half rock is:
d = m/V= 8 g/4 cm³= 2 g/cm³
Answer:
The correct statement is C The diaphragm"s movement downward to draw air into the lungs shows how muscles are necessary to bring air intto the body.
Explanation:
Diaphragm is important part of the respiratory system.During inhalation of oxygen diaphragm moves downward with the help of adjacent respiratory muscle by the same way during exhalation diaphragm moves upward to diffuse the carbon dioxide out of the body.
Diaphragm along with respiratory muscles play an important role in proper gas exchange.
The answer is C. oxygen. Oxygen is the acceptor for hydrogen because in an aerobic reaction oxygen is used.
Spermatozoa. Hope this helps! (:
