Answer:
Human impact on coral reefs is significant. ... Damaging activities include coral mining, pollution (organic and non-organic), overfishing, blast fishing, the digging of canals and access into islands and bays. Other dangers include disease, destructive fishing practices and warming oceans.Factors that affect coral reefs include the ocean's role as a carbon dioxide sink, atmospheric changes, ultraviolet light, ocean acidification, viruses, impacts of dust storms carrying agents to far-flung reefs, pollutants, algal blooms and others. Reefs are threatened well beyond coastal areas. Climate change, such as warming temperatures, causes coral bleaching, which if severe kills the coral.
In 2008, a worldwide study estimated that 19% of the existing area of coral reefs has already been lost, and that a further 17% is likely to be lost over the subsequent 10–20 years.[3] Only 46% of the world's reefs could be currently regarded as in good health [3] and about 60% of the world's reefs may be at risk due to destructive, human-related activities. The threat to the health of reefs is particularly strong in Southeast Asia, where 80% of reefs are endangered. By the 2030s, 90% of reefs are expected to be at risk from both human activities and climate change; by 2050, it is predicted that all coral reefs will be in danger.
B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Correct answer is label B. on the purple shaded area which is inside the ventral horn and dorsal.
Spinal cord is termed as tubular or long thin structure which is made of nervous tissue. It is being extended to the lumbar region which is found in the brainstem from the medulla oblongata.
This is enclosed in the central canal which contains cerebrospinal fluid of the spinal cord. If we combine spinal cord and the brain we come up with Central Nervous System.
Between the second and first lumbar vertebrae is where spinal cord extends and it is where it ends.
<em>The major function of spinal cord is nerve signal transmission from motor cortex to body. </em>
Answer:
I'm doing well thank you. Trust you're doing well also.
Explanation:
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Answer:
1
Explanation:
the answer is the first one
