Troposphere, stratosphere, mesosphere, and thermosphere <span />
False.
The semilunar valves are the pulmomic and aortic values.
the mitral and tricuspid valves prevent back flow of blood into the atria.
It is the most important because we need to know how the earth functions
Answer:
Option 3, Chromatids remain attached to one another until anaphase
Explanation:
Centromere lies at the center, end or other points of the chromosome and joins the two sister chromatids. During cell division, the spindle fibers attaches at the centromere and detaches the chromosomes during the anaphase of the cell division to ensure that each daughter cell gets equal number of chromosomes at the end of mitosis. Centromere plays an essential role in the separation of chromosomes.
Hence, option 3 is correct
