Ice floats<span> on water </span>because<span> hydrogen bonding makes liquid water unusually dense</span>
Ocean plants absorb co2 just like trees do. Any co2 that’s not fixed will mess up the chemistry of the waters
For Absolute dating they assign a numerical date to each rock layer studied
For relative dating they go Through geological dating and stratigraphy processes. Also, they use Uranium Dating.
Kelp --> sea urchins ---> sea otters best represents the feeding relationships in a kelp ecosystem that has not been disturbed
by humans.