Muscles cells contract as actin filaments slide across the surface of myosin filaments, causing the ends of the muscles cell to pull together. this process requires energy in the form of ATP. which process explains how energy is made available for muscle contraction

explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?

the circled areas are referred to   as sunspots.   the sunspots are cooler than the   surrounding area.

sunspots are temporary phenomena on the photosphere of the sun that appear visibly as dark spots compared to surrounding regions. they correspond to concentrations of magnetic field flux that inhibit convection and result in reduced surface temperature compared to the surrounding photosphere.