Pls I need an answer

Explanation:

hi howare you Carrying capacity, or the maximum number of individuals that an environment can sustain over time without destroying or degrading the environment, is determined by a few key factors: food availability, water, and space.20-Nov-2018

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: