What is a zygote? A. A fertilized egg cell that has not yet divided

B. A group of about 100 cells that forms from the fertilized cell

C. An organ that holds and protects the developing baby

D. An organ that supplies oxygen, nutrients, and water to the
developing baby

Where do homologous chromosomes exchange genetic material through crossing over?               a.  chlorophyll    b.  centrosomes    c.  centromeres    d.  chiasma

Where substance is produced during cellular respiration

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