In an insect .
A) the blood vessels do not form a continuous circuit
B) nutrients are circulated through an open circulatory system.
C) the circulatory system is responsible for exchange of respiratory gases
D) the fluid flowing through the heart is the same fluid that bathes the tissues.

Pentane with molecular formula c5h12, exists in three isomeric forms. one shows linear carbon chains, another has one -ch3 groups present on the third carbon atom, and the third has two -ch3 groups present on the second carbon atom. what types of isomers are these? a. geometric isomers b. structural isomers c. halotropic isomers