Answer:
The answer would be pathogenic organisms!
Hope this helps!
Females have 2 X chromosomes as males have one x and one y. The two X chromosomes may carry different alleles for hair color. On one x it may be black on the other x it may be orange. Usually in females one of the x,s is turned off in each cell. So this is why you have female cats that are calico colored meaning some orange some black. The black Allele might be turned on in some parts of there coat and vs.
The answer is aneuploidy.
This means having an abnormal number of chromosomes
in a cell. MAD protein ensures that the spindle fibers
during metaphase of mitosis, attach properly.
The MAD protein inhibits progression to anaphase if this
process of spindle attachment is defective.
Answer: Astronomers think that quasars are located in galaxies which have black holes at their centers. The black holes may provide quasars with their energy. Quasars are so bright that they drown out the light from all other stars in the same galaxy.
Explanation: from N.A.S.As website