A horizontal line in a pedigree chart between two parents represents ?

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

How does the nervous system affect the excretory system?

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs