How many neutrons does element x have if its atomic number is 43 and it's mass number is 153?

What organelle do muscle cells need to have?

Left thumb over right is dominant, and is represented with a capital C. Right thumb over left is recessive, and is represented with a lowercase c.

Which form of coal burns the hottest?

Why does an enzyme not work as well if its active site is changed?

what happens when the solar radiation reflected off the earth collides with a carbon dioxide molecule?

Where are large exoplanets located?

1 pts tracy learned to keep her tent from sagging by strengthening connections between its support poles. for tracy to learn, changes in her brain that involved the strengthening of connections between neurons likely occurred.

For a scientific theory to be valid, which of the following must be true? A. It must be well tested. B. It must be widely accepted. C. It must explain the observable facts. D. All of the above

oxygen has eight protons in it's nucleus. Calculate the number of neutrons and electrons in a neutral oxygen-16 atom.

What are antibodies to defend the cell against "invaders"