I believe blood vessels constrict
Explanation:
the difference between taxis and tropism is that taxis refer to the directional movement of animals in response to a stimulus while tropism refers to the directional movement of plants in response to a stimulus. ... On the other hand, tropism is the response of plants to a stimulus or to move away from it.
Because the nucleus is the center of the cell and where all the extremely important parts are, the nucleus of a cell is like the brain of a person. It is the center of everything and the 'boss' of everything that goes on.
In biology, a mutation is the permanent alteration of the nucleotide sequence of the genome of an organism, virus, or extrachromosomal DNA or other genetic elements. Mutations result from errors during DNA replication or other types of damage to DNA, which then may undergo error-prone repair, or cause an error during other forms of repair, or else may cause an error during replication. Mutations may also result from insertion or deletion of segments of DNA due to mobile genetic elements. Mutations may or may not produce discernible changes in the observable characteristics of an organism.
I think it is what used to be known as Pluto. If you need to look into it more, do that. I need help with these interesting questions.