Because the ring is hollow
So they can tell what exact species it is.
Answer:

Explanation:
Hello,
In this case, since the density is defined as the ratio of the mass and volume:

We can compute the mass of blood as follows:

Best regards.
The primary function of chloroplast is to conduct photosynthesis, which is the process plants use to convert light energy into chemical energy that can be released to fuel the organisms' activities.
The movement of the Earth's plates is called Plate Tectonics. Hope this helps! :D