(1) A limb is lost when two marine organisms fight.
(2) A puppy learns to beg for food by watching
an older dog perform tricks.
(3) A gene is inserted into a bacterium, allowing
the organism to produce insulin.
(4) A random mutation causes the immediate
death of a microbe.
Answer: Become extinct
Explanation: Pearson
Answer: A common ancestor
Explanation: Homologous structures in different species could suggest that they shared a common ancestor.
in the lysosomes
B.
in the nucleus
C.
inside the chloroplasts
D.
on the cell wall
Yes, species pairs show more than one barrier to reproduction. Examples include damselflies with incompatible reproductive organs, species of flowers attracting different pollinators, bird species with different mating dances, and species producing infertile offspring.
Yes, there are several instances where species pairs show more than one barrier to reproduction. These barriers can be prezygotic or postzygotic. Examples include damselfly males and females of different species that have differently shaped reproductive organs, thus creating a mechanical barrier. This means their body parts simply do not fit together and reproduction cannot occur.
Also, two species of flowers may attract different pollinators, creating a barrier known as habitat isolation, in which the species live in the same area but different habitats. Furthermore, bird species may display different mating dances. This is behavioral isolation where species differ in their mating rituals. There's also reduced hybrid fertility where two species of insects produce infertile offspring. The mechanisms of reproductive barriers in nature are complex and diverse in their operation.
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