Seu próximo nível começa aqui
Seu desenvolvimento não pode ter limites. Garanta sua Assinatura Ilimitada e libere uma preparação completa com os melhores professores do Brasil.
Sobre a relação entre as algas e o derretimento das...
TEXTO PARA QUESTÕES DE 18 A 20
Giant Viruses Discovered in Arctic Ice Could Slow
Sea-Level Rise
Hordes of giant viruses are living on the world's second-largest body of ice — and may be slowing the impacts of climate change. Scientists announced the discovery in a recent paper on the Greenland ice sheet. Some of the viruses, they say, have infected algae, potentially limiting the growth of colored snow blooms that can speed up ice melt and raise global sea levels. “They infect the microalgae”, said Laura Perini, one of the paper’s lead authors and a researcher at Denmark’s Aarhus University. “If they kill the algae, then they kind of reduce the speed with which the ice is melting.”
The Greenland ice sheet is the largest single contributor to global sea level rise. Algae can darken the surface of the snow, causing it to absorb more sunlight and melt at faster rates. Researchers suspect that the newly discovered viruses help control that algal growth. That theory isn't yet confirmed — and scientists aren't sure exactly how much algae contributes to melting on the Greenland ice sheet. But algal blooms are growing larger as the planet warms, Perini said, making it important to investigate the factors that affect their growth.
Since being classified in the 1980s, scientists have found giant viruses — or nucleocytoplasmic large DNA viruses — all over the world in soil, rivers and oceans. Perini and her team wanted to find out if they also inhabited icy Greenland. Researchers conducted genetic analyses on samples taken from the ice sheet. They found viral genes hiding in algal cells, indicating that the viruses have been infecting the algae populations for a while — likely hundreds of years.
Scientific American. June 24, 2024. Adaptado.
Sobre a relação entre as algas e o derretimento das geleiras, pode-se afirmar:
A
visto que os vírus gigantes infectam as algas, eles são responsáveis pela desaceleração do processo de derretimento das geleiras polares.
B
embora os vírus gigantes infectem as algas, esse fenômeno acelera o crescente processo de derretimento das geleiras da Groenlândia.
C
dado que os vírus gigantes infectam as algas e as levam à morte, essa ocorrência resulta na redução de um processo nocivo ao planeta.
D
uma vez que os vírus gigantes são danosos às geleiras da Groenlândia, seus efeitos possibilitam o derretimento acelerado da neve local.
E
à medida que a proliferação de vírus gigantes ocorre, há um aumento exponencial de algas que resultam no descongelamento das geleiras.