The correct answer A.eukaryotic cells ,prokaryotic cells. This means the blood cells are eukaryotic and the bacteria are prokaryotic cells.
The red blood cell although lacks nucleus still is considered to be eukaryotic in nature. The stem cell from where the red blood cell originates has a nucleus which disappears on maturity to make space available for carrying oxygen and carbon dioxide .
The bacterial cells are prokaryotic in nature. The bacterial cell is also enclosed by a cell membrane and the cellular contents are present in the cytoplasm. The bacteria lack the membrane bound structures as opposed by the eukaryotes. nucleus, mitochondria and chloroplast are some of the organelles lacking in the prokaryotic bacteria.
The analogy is as follows blood cell: Eukaryotic cell, bacteria: prokaryotic cell
Answer: Option A
<u>Explanation:</u>
The eukaryotic cells are cells that have a well-defined membrane bound organelles and well defined ''nucleus'', a prokaryotic cell does not have any of these characteristics.
Moreover a prokaryotic cell mostly is present in microorganisms whereas a eukaryotic cell is mostly present in macro and multicellular organisms. But there are exceptions to it which contain a single celled ''eukaryote''. Blood cell is a eukaryotic cell whereas a bacteria is a single celled ''prokaryote''.
The elephant, by prying at the bark with her tusks is showing that she needs the water from the tree, and that the water is helpful for animals. Hope this helped!
Ionic bond: It is the bond formed by the complete transfer of electron from one atom to an other atom.
Covalent bond: It is the bond formed by the mutual sharing of the electrons.
Van der waal: These are weak interactions between one molecules with other polar or non polar molecules to hold to each other by weak force of attraction.
<h2>Explanation:</h2>
<u>Similarities between van der waal, ionic bonds and covalent bonds:</u> All of them are a type of inter-molecular forces, in which ionic bonds are stronger than covalent bond and van der walls forces. And covalent bonds are stronger than van der wall forces.
<u>Difference between van der waal and ionic bonds:</u> Ionic bonds are formed by complete transfer of electrons from one atom to an other atom. Covalent bond are formed by sharing of electrons while in van der waal, there is a slight attraction when oppositely charged molecules come close to each others.
Result: Van der wall forces are weakest among ionic and covalent bonds.