What type of organism does the small fish represent in this scenario

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.

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

In which situations is the principle of cross-cutting relationship useful in determining relative age?