The statement that correctly defines coevolution is:
D: Two entirely different species affecting each other's evolution, as in predator-prey relationships.
Another example of coevolution is host-parasite relationship, which happens between totally separated species, but affects the way both of them will evolve.
Answer:
True
Explanation:
Normal flora are microorganisms that are regarded as resident organisms, which can be found on or in an individual and do not cause any disease.
the transient flora refers to microorganisms that are found on the skin or the hands which are there through direct contact with person or object, and are easily removed by routine hand hygiene. Example is Norovirus that can cause stomach flu.
Opportunistic pathogens are microorganisms such as the bacteria and virus, which can only cause infection when the immune system is down. This means that , these organisms can not cause any infection as long as the immune system is ok.
In this case, the normal and transient flora like Norovirus can only cause infection when the immune system is down. That is why they are regarded as opportunistic pathogens.
Most of this oxygen comes from tiny ocean plants – called phytoplankton – that live near the water's surface and drift with the currents. Like all plants, they photosynthesize – that is, they use sunlight and carbon dioxide to make food. A byproduct of photosynthesis is oxygen.
