Como puedo haser que reuere una materia pardida

Which of the following always exist between two objects having mass ● elastic force ● contact force ●gravitational force ●magnetic force

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome

Astudent randomly draws a card from a standard deck and checks to see if it's his favorite suite he then returns the cards to the deck