question:
The ratio of an object's mass to its volume is its

answer:
density.

question:
Which of the following is an example of heat transfer by conduction?

answer:
a whole metal spoon getting hot when one end is in hot soup

question:
The human body is composed of different systems made of specialized cells, tissues, and organs. Each of these structures has a specific function that aids in the survival of the human species. Which organs are used in reproduction?

answer:
ovaries, uterus, and fallopian tubes

question:
Which of these best defines communicable diseases?

answer:
They are spread to others.