Answer:
The correct answer is the second option axon.
Explanation:
Neurons or nerve cells is a cell that transfers electrical signals. Nerve cells are the structural and functional units of the human nervous system. Every nerve cell is made up of 3 parts, a cell body called soma, dendrites and an axon.
The soma or cell body forms an elongated projection, called axon. Axon is responsible for sending electrochemical signals with the help of elaborate ion transport. Some nerve cells have a myelin sheath covering around the axon to facilitate signals faster.
Thus, the correct answer is the second option, Axon.
C) they are multicellular
Bacteria is a large group of unicellular microorganisms. One bacterium is one small organism, and it is prokaryotic cell.
Its stabilising. Since the selection pressure is against the extremes which are the normal blood and the sickle cell anaemia.
Answer:
Due to presence at early days of the planet.
Explanation:
We only find the remains of single celled organisms in the oldest fossils because the single celled organisms are the organisms that were present in the early days of this planet. These single celled microbes were present about 3.7 billion years ago while on the other hand, the oldest rocks are only a little older i. e. 3.8 billion years so these single celled organisms are considered as oldest fossils on this planet.
