Question

directions: select the correct answer from the drop-down menu.
one theory of speciation is described below.
when two populations become so genetically different that they can no longer successfully interbreed, speciation occurs. in order for new species to emerge, selective pressures must favor new traits in a given environment. this can happen when

• an organism is born with new, more favorable traits as a result of a mutation, or
• a population moves to a new environment with new selective pressures.

the emergence of a new species is a gradual process, occurring over many generations as individuals with more favorable traits survive and reproduce more often than individuals with less favorable traits. eventually, the population becomes genetically isolated from other populations of the same species, and speciation occurs.
a group of researchers is studying two different species of beetle. text partially obscured native to central america. they have studied the beetles over several dec text partially obscured species diverged from one another about 4 million years ago and m text partially obscured
the researchers have made many observations regarding these tw text partially obscured an observation that would challenge the theory of speciation descr text partially obscured
over many generations, the two species of beetle are observed to
drop - down menu options: undergo genetic mutations that make them appear identical., occupy nearly identical ecological niches., move into the same environment., independently evolve similarly shaped mandibles., endure nearly identical selective pressures., interbreed and produce fertile offspring.

Explanation:

The theory of speciation states that when two populations become genetically different enough to not interbreed, speciation occurs. If the two beetle species, which diverged 4 million years ago, are observed to interbreed and produce fertile offspring, this challenges the theory because according to the theory, speciation results in genetic isolation (inability to interbreed successfully). Other options like similar ecological niches, similar mandibles, or similar selective pressures don't contradict the speciation theory as much as interbreeding with fertile offspring does.

Answer:

interbreed and produce fertile offspring.