remain

He remained a formidable opponent.

The situation remains tense.

Much remains to be done.

Many questions remain unanswered.

As you can tell, so many questions remain unanswered.

In fact, many things about the Mona Lisa remain a mystery.

And since these bulbs remain viable for quite a long time, even out of the ground, they can be stored or transported long distances without much of a problem, which helps explain the spread of tulip cultivation. 

One factor is the direct effect of logging, which often turns a forest into something approximating a huge pile of kindling (wood for burning): the ground in a logged forest may remain covered with branches and treetops, left behind when the valuable trunks are carted away; a dense growth of new vegetation springs up, further increasing the forest's fuel loads; and the trees logged and removed are of course the biggest and most fire-resistant individuals, leaving behind smaller and more flammable trees.

Scientific evidence to illuminate these ideas has been slow in coming, and many shadows remain.

When raindrops fall on lotus leaves, they remain spherical.

The heavy metals are still there, but instead of leaching into the water system and contaminating the water underground, large amounts of these metals may remain bound to the chitin, to the cell walls of filamentous fungi in the soil, and thus remain chemically inactive for as long as 30 years, perhaps longer.

Some seeds remain dormant in the ground for several years.

Frog species that remain exposed to the sun despite high diurnal (daytime) temperatures exhibit some fascinating modifications in the skin structure that function as morphological adaptations.

Conversely, natterjacks in southern Spain remain active during the mild winters common to the region and are instead forced into inactivity during the dry, hot summer season.

The pollinator, on the other hand, wants to remain well-fed with as little effort as possible.

A fertile, plowed field is rapidly invaded by a large variety of weeds, whereas a neighboring construction site from which the soil has been compacted or removed to expose a coarse, infertile parent material may remain virtually free of vegetation for many months or even years despite receiving the same input of seeds as the plowed field.

Many species appear to remain unchanged in the fossil record for millions of years --- a situation that seems to be at odds with Darwin' s model of continuous change.

That’s about how high an object would have to be orbiting straight up from the equator to constantly remain directly above the exact same spot on the rotating planet Earth.

Groundwater commonly collects in stream drainages but may remain entirely beneath the surface of dry stream-beds in arid regions.

There are almost always pockets of coral on the reefs that remain unaffected.

Dutch peasants were able to remain unaffected by this crisis for a long time because they had specialized in dairy farming industrial crops, and horticulture.

The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.

The question of why the Natufians differed from their predecessors in these and other ways and why they made these first steps toward farming as a way of life remains unclear.

And while there were other artists working on the similar project at the same time, Audubon’s book remains the most well-known and successful of its kind.

Without liquid water to remove carbon from the atmosphere, the level of carbon dioxide in the atmosphere of Venus remains high.

After 1850, however, the expansion of foods more regularly kept pace with population growth, though the poorer classes remained malnourished.

Urban death rates remained high, particularly in the lower-class slums, but they began to decline rapidly.

Many experts in the scientific community, however, remained unconvinced by his conclusions.

A little wine still remained in the bottle.

Finally, nothing will be left of the gaseous exterior of the Sun; all that will remain will be the hot, white core.

Ok. So after the scavengers have eaten the leftovers, only the fish’s skeleton remains.

The hydrogen is extracted and the remaining acids are transferred into a different container for the second phase of the process.

And most of the remaining populations have been significantly reduced by overfishing and environmental challenges.

He will have to remain in hospital for at least 10 days.

I was allowed to remain at home.

While no more hydrogen fuel will remain in the inner zone, there will be a small amount left in the outer zone.

These insects may allow Bt susceptibility to remain in the population.

More human remains have been unearthed in the north of the country.

Most archeologists believed that the glass factories were in Mesopotamia because that’s where the oldest known glass remains come from.

Even today remnants of this practice remain.

Other dangers still remain.

There are Roman remains all around us.