Answer:
The fact that mature red blood cells expel their nuclei, to expand their surface area and transport oxygen, can demonstrate that they cannot live very long.
Explanation:
The absence of a nucleus in mature red blood cells (erythrocytes) means that it has no genetic material and is unable to synthesize proteins to repair itself. This means a relatively short half-life for these cells.
A mature red blood cell circulates in the blood and performs its function for about 90 to 120 days, after which it is eliminated.
Regarding the other options:
<em> B. Red blood cells can live more than 24 hours.</em>
<em> C. The absence of a nucleus in erythrocytes does not indicate any relationship with cancer.</em>
<em> D. Although they do not have mitochondria, erythrocytes can obtain ATP by glucose glycolysis and lactic acid fermentation. Even so, it is not related to the lack of nucleus</em>
Water.
osmosis always refers to the diffusion of WATER down a concentration gradient.
diffusion can be applied to any substance;
osmosis only applies to the diffusion of water.
in the situation described, osmosis occurs by water diffusing out of the plant, down the diffusion gradient (because the salt water effectively has a lower concentration of water than in the plant) and into the salt water.
your answer is:
B. The angle of the slope.
Receptors detect changes in the environment. For a stimulus to elicit a response, certain cells must have an appropriate receptor. Stimulation of the receptor initiates a specific signal pathway.
Answer:
What is the heart rate of a black bear?
ICMs recorded an average of 25.0 ± 1.6 million heart beats/year for the bears (Range: 23.3 - 27.4 million beats/year). Activity sensors documented a minimum of 0 minutes (winter) to a maximum of 1084 minutes (summer) of activity over a 24 hour period.17 अग॰ 201