The phrase "allowed them to invade" is correct and usable in written English.
It can be used in contexts where permission or opportunity is given for an invasion, whether literal or metaphorical.
Example: "The lack of defenses allowed them to invade the territory without any resistance."
Alternatives: "permitted them to invade" or "enabled them to invade".
"Certain animals and plants," Monbiot warns us, even "have characteristics that allow them to invade" – what, like Panzers and U-boats?
"We had announced to the Americans that according to international conventions, we would not allow them to invade our territories, but unfortunately they did not comply," Mr. Salehi said.
That is, one might expect that a sufficient amount of time had passed since they speciated for them to evolve ecological differences that would allow them to "invade" the ranges of each other and coexist over the same area.
"The distribution of many invasive species is today limited by temperature barriers, and climate change could allow them to invade regions that were inhospitable up to now", said the lead study researcher.
A key role of Type III secretion is in overcoming host defense response [42], [43], although these pathways represent only one mechanism that bacteria can employ to silence the host immune system, thereby allowing them to invade and colonize the animal.
As these genetic and epigenetic alterations accumulate, the affected cells assume further growth advantages that allow them to invade local tissues in their host or overgrow unaffected cells in vitro, at some point producing cells that form invasive tumors or cells that possess the capacity to form tumors when injected into animals.
For example, dermatophytes secrete proteolytic enzymes which degrade the SC allowing them to invade and disseminate through it 66 and at the same time altering skin permeability.
During this step, a small proportion of epithelial tumor cells lose cell-cell adhesion and gain higher mobility, thus allowing them to invade the adjacent tissues [ 2, 3].
