causes animals with 
similar selection
 pressures to evolve
In similar environments 
some species may develop 
similar methods to cope
 with their habitat causing
Can sometimes cause such 
different phenotypes it prevents 
mating among 2 cetain offspring 
resulting in a
makes species evolve alongside of 
each other and can increase or decrease  overall
Favors more extreme phenotypes
 among a species  often leading to 
such extreme changes over many 
many years a species may undergo
Causes random gene variation effecting 
With the addition of a large part  
of a populous being removedd creates 
an decrease in genetic diversity making
fitness more important for survival 
and causes the 
Decreases the size of a 
population and allele 
frequency is changeg causing 
Favours animals that have the highgest fitness
 in its current enviroment , this means that
 when a soecies travels to a new evviroment
 it may undergo oevolution leading to the
in specific environments with different
 predators or food availability can cause 
species to evolve 
Can cause either positive or negative specific 
traits to become more prevalent effecting 
causes females of a species to prefer one
phenotype or genotyple over another. this causes
Are greatly diffrent in certain
 enviroments meanign when 
a species is moved from one
 enviroment to another physical 
changes can occur causing the 
among animals that have enolved to have them
causes only certain mates to be viable
Can occasionaly become so diverse that 
one species becomes two after some sort 
of separation occurs and either one or both 
evolve leading to 
Among two animals that coincide
frequently causes them to develop 
similar traits for similar purposes 
these traits are called 
Cause animals to ocaisonaly work 
with or agianst eachother resulting 
in both animals evolving in ways 
relative to the other causing 
Can cause phenotypic difrences 
in certain animals this is called a
Creates genetic variation that either increases 
or decreases fitness which is assisted by
is when genetic material 
from two different populations  
is transferred over during 
reproduction causing 
affects and changes
 allele frequency's causing 
makes species evolve more
 alike one another creating 
are body parts that were once useful 
and slowly evolved to be useless 
over a long time due to 
selects agains extreme phenotypes 
and mutation increasing 
Or