What kind of vertebrate was the likely evolutionary precursor to mammals?

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

Study this image which statement best describes the rock shown check all that apply

You see a white marker with an orange circle and black lettering. what does this marker tell you