4. How does iteration help the engineering design process? (1 point)
It lets engineers know how to complete their experiments.
It provides proof positive that an engineer's plan will work.
It encourages engineers to revisit past steps in the process.
It ensures that all ideas or discoveries are communicated clearly.

The answer is c and this has to be 20 letters

The answer is atmosphere. there are four spheres of the earth: 1. geosphere (from greek word 'geo' = ground), 2. hydrosphere (from greek word 'hydro' = water), 3. biosphere (from greek word 'bio' = life), and 4. atmosphere (from greek word 'atmo' = air). a magnetosphere is a region of space around astronomical objects controlled by the magnetic field of that object. through the process of elimination, since lightning is present in the air, it can be found in the atmosphere.

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass