Eukaryotes are organism known to having nucleus (containing genetic material) and organelles (e.g.the cell's powerhouse, mitochondria, golgi aparatus, ec.) enveloped by a membrane. They can be unicellular (single-celled organism) or multicellular (many-celled), containing tissues and different cell types.
Answer:Estuaries :)
It has to be 20 characters
Because there is insufficient evidence to support the idea that all chimpanzees use tools. the scientist would need lots of hard evidence supporting this conclusion (lots of chimpanzees using tools)
Gradually as the result of many intermediate steps is my answer because as life on Earth for example started off with simple atoms making molecules, and as the time went past more complex compounds were be produced. And from there later on unicellular organisms started appearing. Nothing in evolution that I know of happens in a short time, at least from the human perspective.