Which of the following is an affect of natural selection a. all of the children of two parents are male. b. carbon cycles through ecosystem. c. favoritable enviormental conditions cause an increased food supply. d. polar bears have white fur.

Across of blue x blue (both heterozygous) would result in

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2

The part of the eye that closes and opens to let light in is .