What do evolutionary theories believe?

Answer 1

a)changes in species over time is the result of theor genes changing
b)closely related species will show sinilarities in DNA
c)beneficial traits will become more common over time
d)all of the above

Answer:
The Theory of Evolution does not "predict" anything. A common fault in understanding evolution is to think that it is going "somewhere" - people with bigger brains, better health, less hair etc. This is not the case, evolution is a reaction to environmental stresses. It basically states that in any given population there are individuals that can deal with any stress (hot, cold, need for protective color, etc.) better than others. If this ability makes them healthier and better able to compete for food or mates, they will pass their characteristics on to their offspring and this advantage will eventually be in all their descendants who will make up the whole population.

Answer 2

That trough time, a species of animal, plant, bacteria will change.

When a life form reproduces, one of its offspring may be different from its parents because of reproductive variation. Sometime, this variation may give it an advantage over other individuals of its species. (e.g.: A giraffe has a longer neck and can search food on high trees.) Because of this advantage, the life form that is different (we will call it A) can live longer and has better chances to reproduce. The life form that has not this advantage (we will call it B) will live less longer and will have less chances to reproduce. Because of that, the population of "A" will increase and the population of "B" will decrease. In the end, there will only be "A".

Answer 3

On what do they base their belief? Well, do you mean in practice or in theory? In practice, I'm certain biologists individually believe what they believe based on what they learned from books in school. Most biologists haven't gone out and proven evolutionary theory on their own, if that's what you're asking. They're going by what someone else claims and trusting it, so they don't know its truth themselves per se much like you don't know the truth of what newspapers claim, you rest your belief on the authority of the journalist or the editor.

In theory, evolutionary Biology began as a hypothesis historically which has been corroborated over time with findings in geology and genetics and zoology, for instance. If you go by the Popperian understanding of science, then we don't know it to be true per se, but we haven't falsified it and so it's a working theory. Some claim that evolutionary theory is falsifiable, but that's a subject for a philosopher more than a biologist.

Answer 4

Evolutionary theories propose that species change over time through the process of natural selection, where individuals with advantageous traits are more likely to survive and pass on their genes to the next generation. This leads to the gradual evolution of species and the diversity of life on Earth.

Answer 5

It states that all matter is made up of combinations of the six quarks and six leptons that interact with the various types of force particles.

Answer 6

That allele frequencies change within populations over time due to four main mechanisms: mutation, genetic drift, natural selection and migration.

Answer 7

Evolutionary theories are abstract concepts not people and so do not "believe" anything, they just are.