Answer:
Embryonic stem cells could be used to make more specialized tissues that have been lost to disease and injury. For tissues that are constantly replaced, like blood and skin, stem cells would probably be replaced directly.
Explanation:
The correct answer is the second option. Animals have two major types: vertebrates and invertebrates. Vertebrates are animals that have backbone while the invertebrates do not have one. Examples for vertebrates are birds and mammals while the latter are insects and squid.
Many living organisms respond to things in the environment called Stimuli.
A cell, they are the tiniest living thing on earth.
I believe the correct answer is C. Nektons include bony fish and squid.
