Answer:
A collection of hot gases that sometimes produces light from nuclear reactions.
Explanation:
The individual cells within the nervous system that functions by receiving, integrating, and communicating information are known as nerve cells or neurons.
The nervous system is a complex set of cells, tissues, and organs responsible for the coordination, control, and transmission of information in the body of animals.
The basic units of the nervous system are the nerve cells or the neurons. They are primarily responsible for receiving sensory inputs from the environment, transmitting the information as electric signals or nerve impulses to the control center (the brain), and monitoring the signals sent out to effector cells or tissues.
More on the neurons can be found here: brainly.com/question/24217914
This is a type of transmission called contact transmission.
Contact transmission is the most common form of transmitting diseases and virus. Contact transmission any be direct or indirect transmission. Direct contact transmission occurs when there is a physical contact between an infected person and the susceptible person. Indirect transmission occurs when there is no direct human -to human contact. Contact occurs from a reservoir to contaminated surfaces or objects.
Mainly because of time. The precambrian era started millions of years ago, and organisms didn't have enough time to change and adapt to form new species, since this is something that takes a long time to occur.
Hope it helped,
BioTeacher101