There are three domains, and six kingdoms.
The organs of the urinary system are organs of excretion—they ... filter the blood to remove metabolic wastes and then modify the resulting fluid, which al- ... But in the kidneys, we find an unusual capillary bed that is both...
it is b because you see take a ruler and measure it
Answer:
There needs to be enough sea urchins for otters to come and there needs to be enough otters to eat the urchins.
Explanation:
