The phrase "and more persistent and" is not correct as it is incomplete and lacks clarity in written English.
It can be used when comparing two or more qualities, but it needs to be part of a complete sentence for proper context.
Example: "The new software is faster, more efficient, and more persistent than the previous version."
Alternatives: "and increasingly persistent" or "and more tenacious".
The humming and throat-clearing would get louder and more persistent, and soon she'd appear at my door and ask if I wanted a cup of tea.
In three of the last five winters, stratospheric temperatures in the Arctic were lower and more persistent, and covered a wider area, than at any other time in the last 20 years, said Dr. Ross Salawitch, an ozone researcher at the Jet Propulsion Laboratory in Pasadena, Calif., who was one of hundreds of American and European scientists from many institutions involved in the recent Arctic survey.
The latter appear larger and more persistent, and are typically found in older women.
When a cat is "calling," her cries typically becomes much louder and more persistent, and occur alongside other behaviors noted below.
Ethanol could cause an increase in dissolved concentrations and more persistent plumes due to cosolvency and decreased hydrocarbon biodegradation rates.
It is this extra warm air descending from above that strengthens the inversion layer, and allows thicker and more persistent clouds to form.
And as machines grow more and more able to do tasks that we once did, as they grow more and more capable of thought, as they become more and more persistent, possessing more and more of the power to endure, possibly forever, we desire, more and more, to merge with them.
Benzene plume elongation and longevity were more pronounced in the presence of alcohols that biodegrade slower (e.g., propanol and n-butanol), forming longer and more persistent alcohol plumes.
The move seemed at least in part an effort to appease the protesters in Hama, where demonstrations have grown bigger and more persistent since the military and the security forces withdrew in June for reasons that remain unclear.
The second, released in Japan three weeks ago, said that profound effects were already being felt around the world, including mounting damage to coral reefs, shrinking glaciers and more persistent droughts, and warned of worse to come — rising seas, species loss and dwindling agricultural yields.
They were also more numerous and more persistent.
