In the body, two types of the synapses occur, chemical and the electrical. The chemical synapses are the most common type of synapse. The chemical synapse works by the release of chemicals from presynaptic neuron and the binding of the chemical messenger to the receptors of the post synaptic neuron.
The binding of the neuron may result in different effects in the post synaptic neuron, it may be inhibitory or excitatory, depending on the messenger. Hence, the chemical synapse provides a variety of signals. In case of electric synapse, the signals will always excite the post neuron, which may not be required sometimes. Hence, the electrical signals will not provide the inhibition of the post synaptic neuron.
Answer: Speciation
Speciation is biological process in which new species are formed from the existing species. This occurs when the members of the population gets separated from others by a geographical, behavioral or other barriers. Such separated organism develop traits with the course of evolution, which makes them reproductively isolated with the parent population. The speciation can be of two types:
1. Allopatric speciation: The separated population evolve into separate species due to a geographical isolation.
2. Sympatric speciation: The separated population evolve into separate species without any geographical isolation.
Answer:
Eukaryotic organisms have no nucleus and prefer aquatic or moist environments. Interestingly, some are parasites, and some do not have mitochondria.
Explanation:
You may need to add some more sentences to better link these two together.
Answer:
kill cells and tissues outright
Explanation:
Sometimes bacteria multiply so rapidly they crowd out host tissues and disrupt normal function. Sometimes they kill cells and tissues outright. Sometimes they make toxins that can paralyze, destroy cells' metabolic machinery, or precipitate a massive immune reaction that is itself toxic
Acrroding to http://needtoknow.nas.edu/id/infection/how-pathogens-make-us-sick/