<u>Answer:</u> "Chemical fossils"evidence supports the notion that sponges are some of the earliest known multicellular animals.
<u>Explanation:</u>
Sponges are multicellular animals, may belong to Ediacarian period likely to be 80 million years ago or earlier. They catered through a complex system of internal channels, by moving seawater.
Sponges are soft-bodied and very rarely protected as fossils, therefore finding evidence of existence is giant task. The key of their existence came to know from abnormal chemicals which is a steroids of a particular type generated sufficiently by them but virtually never by ordinary organisms.
Analysis of long strata sequence found in Oman and researchers have been able to extract these "chemical fossils" from samples spanning tens of millions of years — before, during and after the Ediacarian period.This gave clear evidence that sponges had to have evolved long before the great variety of multicellular organisms proliferated at the dawn of that time.
Jean-Baptiste Lamarck is the researcher who developed the theory
of use or disuse, also called the theory of acquired characteristics. Jean-Baptiste Lamarck is a French biologist, Lamarck
founded a school of French Transformationism which included Étienne Geoffroy
Saint-Hilaire, and which corresponded with a radical British school of anatomy
based in the extramural anatomy schools in Edinburgh, Scotland, which included
the surgeon Robert Knox and the comparative anatomist Robert Edmond Grant.
T would be 31.5% - the same as A. C and G would be about 18.5% each. A & T and C& G are always found in about the same percentages of each other. A = T (Total of 63%, subtract from 100 = 37% which will be equally shared by G and C at 18.5)
The answer is B. Shark. This is because sharks are a "sea" creature. So they will only be found in the ocean OR in a salt-water aquarium.
Its a powerful research tool that helps scientists understand how highly migratory animals interact with their environment. I seen this in my dictionary of science, NOT GUARENTEED its the answer tho, good luck and hope this helps.
