chlorine has two stable isotopes, cl-35 and cl-37. if their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the natural abundance of cl-35? (the atomic mass of chlorine is 35.45 amu.)

Which scenario describes intraspecific, indirect competition? a. a peacock defends its territory against another peacock. b. lions and hyenas compete for the same prey animals. c. a male black bear eats fish in an area of a lake, so other black bears can’t. d. different species of birds fight over spilled popcorn on the ground.

On a test the graders have a mean of 77 and a standard deviation of 8. if we can approximate the distribution of these graders by a number distribution what percent of the students. a) scores higher than 77? b) should pass the test (grades > 60)? c) should fail the test (grades < 60)?

How do you pass the sat? i need sum pointers , and studying advice : (