The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
Mold fossils
Cast fossils
Trace fossils
Enzymes are large molecules that speed up the chemical reactions inside cells. Each type of enzyme does on specific job. Enzymes are a type of protein, and like all proteins<span>, they are made from long chains of different </span>amino acids<span>.</span>
Answer:
organelles are very similar to present-day bacteria, suggesting a common ancestor.
Explanation:
Some evidence suggests that some organelles like mitochondria and chloroplasts within eukaryotes were once used to be independent eukaryotes.
Endosymbiosis theory says that ancestral prokaryotic cells engulfed bacteria like cyanobacteria which with time evolved into mitochondria and chloroplast. Molecular evidence also proves that these organelles were once prokaryotic organisms because they show similar genetic makeup and ribosome type.
So these organelles are similar to present-day bacteria showing that they have a common ancestor.
A membrane bounded organelle whose main function is to undergo protein synthesis would be the ribosomes. These can be embedded in the endoplasmic reticulum or be freely floating in the cytoplasmic region of the cell.
An ecosystem could probably survive without carnivores and decomposers. Carnivores are organisms that are dependent upon other organisms for their food and energy requirements. ... These organisms will limit the population of other organisms for example herbivores. Therefore, without carnivores the ecosystem will survive.n:
