A mid-ocean ridge is an underwater mountain system formed by plate tectonics. It consists of various mountains linked in chains, typically having a valley known as a rift running along its spine.
Answer: The correct answer is-
Allopatric- option 2.
Sympatric - option 1.
Allopatric and sympatric are primarily the two major mechanisms for speciation ( formation of new species from an ancestral species).
In allopatric speciation, a population splits into two different species when it is isolated by physical or geographical barrier.
On the other hand, sympatric speciation occurs wihtin the same area. A population splits into two species that is becomes reproductively isolated when a change in the chromosome number occurs.
Thus, option first corresponds to sympatric whereas option second shows allopatric speciaton.
Answer:
The Highlands are older as evidenced by their crater density.
Explanation:
Obesity has become one of the most serious social problems in developed countries in Japan. The gut microbiota was long thought to contribute to obesity, the exact association remains largely unknown. Gut microbes are key to many aspects of human health including immune, metabolic and neurobehavioral traits. Different levels of evidence support the role of gut microbiota in human health, from animal models and human studies.
Obese and non-obese subjects had different gut microbiota compositions and that certain bacterial species were significantly associated with each group (obese: Blautia hydrogenotorophica, Coprococcus catus; non-obese: Bacteroides faecichinchillae, Bacteroides thetaiotaomicron)
Learn more about Gut microbiota - brainly.com/question/28460493
#SPJ4