<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.
Answer:
I think that answer A is correct
Well, when chromosomes cross over during prophase 1 of meiosis, the homologous pair of chromosomes exchange segments of DNA which happen to be the genes. So the significance of crossing-over during prophase 1 is that it adds genetic variation to sexually reproducing organisms.
Answer:
Enzima conversora de angiotensina
Explicação: A redução da pressão arterial do corpo é devido à homeostase. homeostase refere-se à capacidade do corpo de regular o estado interno se houver mudança no ambiente externo. Nosso corpo tem a capacidade de manter o ambiente interno do corpo estável devido à mudança que ocorre no ambiente externo do corpo. Baixar a pressão arterial ao normal é um exemplo de homeostase. A enzima de conversão da angiotensina é responsável por baixar a pressão arterial ao normal.
