hundred of plant and animal have and continue extent then where are the new species to replace them?

Question

please be scientifict

Answer 1

Extinction can happen in the blink of an eye. The passenger pigeon vanished in less than 100 years after filling the skies in such numbers that they could blot out the sun. Evolution of a new species takes a much longer time. In simple terms, here is what happens:

1. An extinct species creates a void in the food web. The food species that it ate is under less pressure and increases in number.

2. Another species begins to exploit the increased food source. Over time individuals of the exploiting species will adapt to the food source while others may not.

3. The exploiting individuals may develop into a population of the species which is separate from the nonexploiting individuals of the species. If this separation continues (no interbreeding between the two populations) then the characteristics of the two populations may change, creating different races within the species.

4. If the populations continue to remain separate then behaviors and physical characteristics may develop which will prevent the two populations from interbreeding (courtship rituals may change, physical characteristics such as coloring or size may make individuals from the other population unattractive as mates).

5. Over hundreds or thousands of years of separation these two populations which had started as one may be distinct species that will not interbreed. If forced to mate then the offspring may be sterile, (such as when a horse is mated to a donkey producing a mule).

Notice that I have said nothing of random mutations. Variations occur naturally and can cover an extreme range depending on the number of genes which control a characteristic.

When a population splits into two or more populations which remain separate each population may ultimately exhibit only one extreme or the other of a certain characteristic. This is because the environment that a particular population lives in may favor one expression of that characteristic over others. This was seen dramatically in England during the industrial revolution. A moth that lived on a tree with light bark had coloration which matched that tree. When the soot from coal burning factories caused the trees to turn dark, the light colored moths were easily spotted by birds. This darker colored individuals of this species were favored and grew in numbers. When coal was replaced by oil and gas as fuel, the trees returned to the natural color of bark and the population of the moths followed suit.

The moths did not evolve into a new species because the populations were not split, but it does illustrate how environmental factors can favor the expression of particular characteristics.

Speciation takes much longer than extinction. Gradual changes selected over time by environmental influences over populations which have split from each other is one way that species develop.

Answer 2

Well i think at the current time plants and animals are going extinct much faster than new species are coming about through evolution. There are always new species being discovered though most of them have been around for some time just have never been found until recently. One interesting thing to note is that animals and plants are showing rapid evolutionary changes to global warming in particular, for instance some animals have shorter gestation periods, some are mating sooner in the season, some have even shown other traits such as changes in size of body parts etc.

Answer 3

There's alot of things that have been said to be extinct and recently there've been things which have been said to not have been extinct for thousands of years.

There are thousands of new species and mutations that happen every few month's to each year, and there's so many we can't document them all.

Not only that the deeper we dive into the water and near ocean floor find life surviving and thriving in places previously believed unlivable due to extreme heat and pressure conditions, but there's more life down on the bottom of the oceans floor and way beneath the sand even.

Answer 4

Most species compete with other species in their habitat. If one of them goes extinct, than the competing species take up their niche and grow in population because of the lower competition. If however, the extinct species was a "keystone species" that helped the survival of other types of organisms (think bees and how they pollinate flowers), then everything that depended on that keystone species may go extinct too unless they can find a way to adapt.

Answer 5

New species do not pop out of nowhere. When an animal becomes extinct it just dies. Evolution is a lie. Read the Bible.
When a new animal is discovered it is not a new animal but an animal that was created by God but we just did not know about it until recently.

Answer 6

Dogs, cats, roses, orchids and other animals and plants humans have changed.

There are more dogs living now then has ever lived in the past.
There are so many new kinds of roses that some don't even have names but can be bought for a few bucks.

Answer 7

the tolerant one will survive this harsh world!

Answer 8

two words

Jurassic Park,

sometimes its best to let sleeping dogs...sleep

Answer 9

obviously we havent found them....