Answer:
Because it is a solid that has trapped air with the water molecules in cold temperature thus creating a hard solid.
B. Reproductive organs are formed by the body
Answer:
Option A, by having a constant supply of blood
Explanation:
Blood that flows to the muscles bring oxygen from the atmosphere to the contracting muscles where it gets consumed. During large muscle exercise, two physiological needs arise – a) high and prolonged muscle blood flow and b) regulation of blood pressure so that there is adequate perfusion of pressure to all organs. In order to meet both the requirements, the blood flow increases so that the vasoligating muscles do not outstrip the cardiac output.
Hence, option A is correct
Heterotrophs depend on photosynthesis as a source of oxygen
