What subject is this again ? If I know now then I would have a better understanding of what I’m gonna answer so you don’t get it wrong !
Answer:
Density is a measure of how heavy something is compared to its size. If an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float.
#learnwithbrainly
A.
These are characteristics of viruses.
They originated from cetral asia, but the americans brought them over.