Centrioles are organelles that are found only in animal cells and they produce D) flagellum and centrosomes.
Centrosomes help organize the microtubules present in the animal cell during cell division and also regulate the cell cycle.
Furthermore, the flagellum produced by centrioles in sperm cells help the cell move towards the egg and cause fertilization.
Bro why do people pit the answers down in the question? It’s annoying as hell
Answer is B) 1, 3, 2
Fish with craniums naturally preceded the evolution of sharks, since sharks have craniums. Sharks must have evolved from a cranium-wielding ancestor.
Sharks evolved about 450 million years ago, before land vertebrates (animals with spines and skeletal systems) even existed. Mammals evolved about 100 million years later.
It’s b if not then I’m wrong
Answer:
polar microtubules contract, pulling attached chromosomes toward the poles.
Explanation:
Polar microtubules are one of the two types of microtubules that together make the mitotic spindle. The polar microtubules are the ones that extend from each pole to the cell's equator.
At the equatorial region, the polar microtubules from two poles overlap. Also known as non-kinetochore microtubules, the polar microtubules do not get attached to the kinetochores of chromosomes.
The function of the polar microtubules is to assist in chromosome separation during anaphase. The polar microtubules from two poles slide past each other. As they slide, the degree of overlap is reduced and the two opposite poles are pushed apart.
The reduced overlap between the polar microtubules indirectly moves the chromosomes apart as the kinetochore microtubules attach the chromosomes to the opposite poles.
