The second stage is where the brain waves become larger and punctuated with occasional sudden bursts of electrical activity. In this stage the eyes are not able to respond to light. Non-rem sleep has 3 stages. The first stage is the twilight zone which is between full wakefulness and sleep and the third stage constitutes the most profound state of unconsciousness.
Answer:
All of the above
Explanation:
The nucleus constitute DNA-protein complex termed chromatin. Chromatin is simply DNA double helix entwined around proteins referred to as histones. These appear like beads when stretched out, and each “bead” (DNA and histone) form the nucleosome. Genes are hereditary materials found on DNA. Chromosomes are composed of closely-packed chromatin, and become clearly visible under a microscope during mitosis. During this stage the chromosomes have undergone the S Phase of the cell cycle, hence a copy of the DNA has been synthesized by DNA polymerase.
Answer:
When exercising, your body uses more oxygen and produces more carbon dioxide and your muscles also need energy to contract because of this your breathing needs to increase.
Hope this helps :D
The best explanation for this question is B (for mammals) (it could be E if you replace the blood cell with another nucleated cell, or if the blood cell is nucleated like in birds).
The erythrocyte (also called red blood cell) is part of the figured elements of the blood. In mammals, it is an anucleate cell (devoid of nucleus). Its cytoplasm is rich in hemoglobin, which transports oxygen (O2), but is very poor in organelles that exist only in trace amounts.
