Answer The gravity and the sun
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Toe nails are made of keratin
This observation supports the theory of continental drift, and supports the theory of supercontinents.
The cell wall is a tough and rigid layer that surrounds some types of cells. It is located outside the cell membrane and its main function is to provide rigidity, strength, protection against mechanical stress and infection. It can also provide the cell with limited plasticity that will prevent the cell from rupturing due to turgor pressure.
One major difference between viruses and other cells is that viral particles have nucleic acid located within a capsid.
<h3>Structure of a virus</h3>
Viruses are made up essentially of ribonucleic or deoxyribonucleic acids enclosed in a proteinous shell known as capsids.
This is unlike other cells in which their nucleic acids either lie freely within the cytoplasm of their cells or are enclosed in a double membrane structure known as the nucleus.
Viruses are essentially non-living when outside a living host.
More on viruses can be found here: brainly.com/question/2401502
