Which of the following organisms has an open circulatory system?

a) dogs b) spiders c) earthworms d) squid

B. Spiders

Explanation:

The open circulatory system is a type of circulatory system in which the blood bathes the tissues directly. It is a characteristic of arthropods and many mollusks. Spider is an arthropod and have an open circulatory system. Spiders have a dorsal, tubular heart that serves to pump hemolymph into a dorsal artery. The arteries deliver the hemolymph into the hemocoel, the large spaces that collectively make a blood cavity. The heart has openings in its walls. These openings are called Ostia through which hemolymph re-enters the heart.

the sun d the answer is sun

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )