Which of the following are unique characteristics of the circulatory system of a cephalopod?

a) blue blood
b) 1 heart
c) open system
d) 3 hearts

What is the correct trna sequence that would match the following mrna sequence. gcgaua

The green colored pigment in chloroplasts is? a. nitrogen b. chlorophyll c. chlorophorm d. chlorofloromethane

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons