Explanation:
In hypotonic environment, the water would enter into the RBC in order to reach the equilibrium or equal concentration both inside and outside of the cell, which would cause the RBC to expand, and even burst
Hag Fish and Lamprey
Vertebrates are the organism which posses a vertibral column(aka the spine or back bone structure), while the earliest had a head they lacked a spine and jaw, these jawless vertebrae lived 500-600 million years ago. they are the ancestors of bony fish which in time became amphibians and other groups of animals
An Organelle is any number of organized or specialized structures within a living cell.