Answer:
innate immunity : highly specialized defenses.
Explanation:
Immunity against infectious diseases are 2 types - innate immunity and acquired immunity. Innate immunity is the type of defense mechanism which is present at birth. This type of immunity does not depend upon the immunization. This type of immunity is not highly specific as acquired immunity. Innate immunity has no memory and response in first-rate towards the antigens. The phagocytic cells, dendritic cells are some cells of the innate immune system. This changes throughout the lifetime. Different species have different innate immunity. It means different species show different susceptibility to different diseases. e.g Rats are unsusceptible to Diphtheria while men, guinea pigs are highly susceptible to Diptheria.
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Many of the species in the pond would be affected by a decrease in the perch population. The pond's organisms would overpopulate without the perch population.
The role of these bacteria in the nitrogen cycle is to convert free nitrogen into usable nitrogen.
Answer: Option D
<u>Explanation:</u>
Bacteria plays a vital role in the conversion of free nitrogen into biologically available forms. The Nitrogen cycle is the biochemical cycle which involves bacteria. The Nitrogen fixing bacteria are either free living or symbiotic.
Nitrogen is found in different forms in the earth’s surface. 78% of the earth atmosphere contains Nitrogen gas. These gases are Inert and hence the bacteria act upon it to produce simpler form of usable Nitrogen through the Nitrogen cycle.
Am not sure at the moment but am sure someone will help in a bit
