The answer is D, all the time
Answer:
C) When common lands are protected, land degradation slowly disappears.
Explanation:
The blood-brain barrier functions to regulate the movement of materials from the blood to the brain (option A).
<h3>What is the blood-brain barrier?</h3>
The blood-brain barrier is a structure in the central nervous system (CNS) that keeps various substances found in the bloodstream out of the brain while allowing in the substances essential to metabolic function, e.g. oxygen.
The blood-brain barrier serves as a protective barrier for the brain that prevents the entry of substances in the bloodstream that can cause brain damage.
Therefore, the blood-brain barrier functions to regulate the movement of materials from the blood to the brain.
Learn more about blood-brain barrier at: brainly.com/question/9643165
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Answer:
Darwin gave the concept in evolution of species.
Explanation:
- As we know the tree of life is quite massive and comparing it needs to be understood well in terms of fossils that were once hidden inside the layers of earth rock masses. The tree is phylogenetic representing the unique ancestral history of every creature.
- Analyzing their morphological, behavioral and habitats are mostly evaluated in the tree of life
- One major challenge is to find the roots of life for the evolutionists.
- Finding out the nature of the last common ancestor.
- Some theories suggest that the same ancestor has the same common history of origin may lead to confusion of evolutionist as acing them becomes difficult.
Answer:
Flowers have male parts called stamens that produce a sticky powder called pollen. When pollen from a plant's stamen is transferred to a different plant's stigma, it is called cross-pollination. Cross-pollination produces stronger plants. The plants must be of the same species.
Explanation: