Biologists know that chlorophyll, the pigment responsible for photosynthesis in plants, absorbs red light. Describe and design a
machine that could test for the presence of chlorophyll.

The precision of a laboratory instrument is ± 0.05 g. the accepted value for your measurement is 7.92 g. which measurements are in the accepted range? check all that apply. 7.85 g 7.89 g 7.91 g 7.97 g 7.99 g

Question part points submissions used suppose that 2 j of work is needed to stretch a spring from its natural length of 26 cm to a length of 36 cm. (a) how much work is needed to stretch the spring from 28 cm to 32 cm? (round your answer to two decimal places.)

In a star, nuclear fusion occurs in the a. photosphere. b. corona. c. radiative zone. d. core.