<h2>Answer:</h2>
The two reasons are given below:
- Natural selection.
- Lack of food
<h3>Explanation:</h3>
Natural selection is the phenomenon of the evolution in which the organisms able to fit in the changing environment survive while other organism died. Hence the survival if the fittest and then these organisms. Further reproduce to give birth organisms more fit to the changing environment.
The long neck giraffe survive but short neck died. So the population of long neck increased while short neck go extinct.
Other reason is the change of food resource. The food resource change from grass to long trees.
The bones in your arm are a structure that first appeared in lobe fin fishes, such as the Eusthenopteron fish.
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Answer: People were probably not getting vaccinated or the bacteria became immune to the vaccine.
Explanation: yw plz mark brainliest i need one more (:
Blue Carb which scientifically is known as “<span>Callinectes sapidus” is a type of vertebrates. </span>A possible reason for the fluctuation in their population can
be the eutrophic dead zones in the Chesapeake Bay which naturally cases low
levels of oxygen dissolving into the Bay leading to fluctuation of Blue crab
population.
<span>Another reason also can be the shorter
life span of blue crab, its average life span recorded is one to three years
which is very short in comparison to striped bass, although some blue crabs are
caught after being tagged at the age of 6 to 8 years as well.</span>
<h3><u>Answer;</u></h3>
A). Organic compounds would not be available for use by autotrophs.
<h3><u>Explanation;</u></h3>
- The stability of an ecosystem depends on the actions of the decomposers.
- Therefore, if there were no decomposers in an ecosystem then, wastes and the remains of dead organisms would pile up and the nutrients within the waste and dead organisms would not be released back into the ecosystem. Producers would not have enough nutrients.
- The carbon and nitrogen necessary to build organic compounds, and then cells, allowing an organism to grow, would be insufficient. Other nutrients necessary for an organism to function properly would also not be sufficient.
