Answer:
Blood Brain Barrier(BBB)
Explanation:
This is a biological interface of special endothelial cells of astrocytes, pericytes , capillaries, neurons and other structures, acting as a physical barrier or gate separating the Central Nervous system from the peripheral blood circulations. Thus it formed a tight junction serving as a physical barrier to selectively regulate the entrance of substances from the cerebral blood flow into the brain, therefore maintaining homeostasis of the brain.
From above any substances absorbed into the blood stream irrespective of the mode of entry are transported through the BBB, and are selectively regulated to enter the brain cells by the BBB's interactions with the blood vessels, hormones etc.
Basically it allows the passage of nutrients, a few drug, hormones and resists certain toxins and pathogens for the brain homeostasis.
All living things have cells, they reproduce, they more in some king of
way/ grow, and they use energy from some sort of water and food.
The number of sunflower sprouts will be higher than birch tree sprouts because sunflower sprouts have a higher growth rate than birch tree sprouts.
<h3>What is the growth rate?</h3>
Growth rate refers to the ratio of development of a given population and/or biological structure.
The growth rate may result very useful in ecology studies as above mentioned (ecological succession).
In conclusion, the number of sunflower sprouts will be higher than birch tree sprouts because sunflower sprouts have a higher growth rate than birch tree sprouts.
Learn more about the growth rate here:
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If the problem is not addressed the world we become hot because of global warming.
three effective solutions would be a decrease in CO2, no more fossil fuels, and stop littering
