What type of cells have one set of chromosomes? meiosis vs mitosis

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.

What came first egg or chicken? and is tomato a vegetable or a fruit?

What was the land like over 500 million years ago? what was under the sea?