Answer:
Blood-brain barrier.
Explanation:
Blood brain barrier may be defined as the barrier between the blood capillaries and the component of the brain tissue. This blood brain barrier provide protection against the pathogens present in the blood.
The blood-brain barrier uses tight junctions that prevent the entry of microbes in the underlying tissue. The tight junctions allows only the entry of some selected particles and prevent the entry of other particles.
Thus, the correct option is (3).
Answer:
c. Ecosystem science
Explanation:
<em>Sustainability is incorrect because it means the existence of resources for a long term.</em>
<em>Environmental science is incorrect because it is the branch of science that studies the processes and interactions that affect the environment.</em>
<em>Biodiversity science is incorrect because it is the study of various species that occupy a particular area.</em>
The correct option is c. Ecosystem science is the study of community of living organisms, how they interact with themselves and with non-living components of the community.
Some organisms, such as plants, can trap the energy in sunlight through photosynthesis and store it in the chemical bonds of carbohydrate molecules. The principal carbohydrate formed through photosynthesis is glucose.
Hope this helps!
-Payshence
Answer:
Sugars and phosphates
Explanation:
DNA is deoxyribonucleic acid.
The backbone is based on a repeated pattern of a sugar group (deoxyribose) and a phosphate group.
The image below shows one straightened-out strand of DNA with a backbone of alternating sugars and phosphates.
A is wrong. There is no ribose in DNA.
B is wrong. The nucleic acids A, C, G, and T join one strand of DNA to the other.
C is wrong. There is no RNA in DNA.
