Which properties of protists make it difficult to group them in any other group?

Which of the following is an advantage of solar energy?

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Select three sports that require participants to be highly fit before the beginning a: snowboarding b: skydiving c: rock climbing d: bungee jumping e: free diving f: hiking