circulatory system
muscular system
skeletal system
Which system should also be included in the list?
(1) immune system (3) digestive system
(2) reproductive system (4) nervous system
Answer:
4.) Nervous System
Explanation:
Nervous system helps in nervous coordination and it is the system that provide communication to all the parts of the body through electrical and chemical impulses.The two nervous system are;
1.)Central nervous system(CNS)
2.)peripheral nervous system(PNS).
The central nervous system control all behaviors and its is the largest part of the nervous system, with inclusion of the brain and the spinal cord.
Nervous system have communication with several other body systems
For instance, when we run the nervous system send message directly to other part of our body system such as; The circulatory system,muscular system and the skeletal system about the activities that is about to take place and that the Skeletal muscles need neural inputs to begins it's contraction.
B. Genetic equilibrium has been maintained.
C. Mutations have arisen that may have altered allele frequencies.
D. Individuals with new genes have immigrated into the population.
The correct answer is option C, Mutations have arisen that may have altered allele frequencies
There have been several instances where mutation in the gene of an insect is caused due to the harmful external environmental condition which are either created or occurs naturally. Usually, the organisms evolve themselves to sustain in an adverse environment condition. In the process of evolution, they go through the process of positive genetic mutation but sometimes the mutation may also produce negative effect on the DNA of an species through wrong or inefficient pairing/coding. Here in this case it can be stated that the chemical sprayed on insects might have attacked the gene pool of the insects thereby producing adverse genetic mutation.
When a farmer sprays insecticide on crops, the DNA of the insects that are not killed can be damaged, leading to mutations that may alter allele frequencies in the population.
A farmer spraying insecticide on his crops to kill unwanted insects has the effect of damaging the DNA of the insects that are not killed. This can lead to mutations that may alter allele frequencies in the insect population. Hence, the correct answer is C. Mutations have arisen that may have altered allele frequencies.
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Answer:
4) The neuron receives a stimulus great enough to start an impulse.
5) Gated Na+ channels open. The net movement of Na+ ions into the cell produces the action potential..
2) Na+ gates close and K+ ions flow back out of the cell restoring the resting potential.
1) The impulse continues to travel down the axon away from the cell body.
3) Gated K+ and Na+ channels are closed. The inside of the cell is slightly negative compared to the outside.