They have bilateral symmetry and a rounded shape.
Answer:
C. Melting and Solidification
Explanation:
<span>1) sum of all ecosystems in the world : Biosphere
</span>Biosphere is the worldwide sum of all ecosystems. It can also be termed the zone of life on Earth. T<span>he </span>biosphere<span> overlaps the lithophere, atmosphere, and hydrosphere.</span><span>
2) All populations within an ecosystem : Community
</span>A community is all of the populations of various<span> species that </span>sleep in a similar space<span> and </span>act<span> with </span>each other<span>. A community </span>consists<span> of all of the </span>organic phenomenon<span> factors of </span>a part.<span>
3) Interbreeding members of a species in an ecosystem :</span><span> Demes
</span>A deme could be a<span> term for </span>an area<span> population of polytypic species that actively </span>crossbreed<span> with </span>each other<span> and share </span>a definite cistron<span> pool.</span><span>
4) A defined area consisting of biotic and abiotic components : </span><span>An </span>ecosystem
An scheme could be a<span> community </span>created from<span> living organisms and </span>non-conscious parts like<span> air, water, and mineral soil.</span>
