How is the loss of a keystone species from an ecosystem similar to the loss of an indicator species.

The recommended daily calcium intake for a 20-year-old is 1,000 milligrams (mg). one cup of milk contains 299 mg of calcium and one cup of juice contains 261 mg of calcium. which of the following inequalities represents the possible number of cups of milk m and cups of juice j a 20-year-old could drink in a day to meet or exceed the recommended daily calcium intake from these drinks alone?

What kinds of antigens are found on the rbcs of a person with a+ blood

Summarize the work of famous environmental scientists of the past.