Answer:
Explanation:B ice melting is a phiyscal change and the mass of the substance remains the same
Answer:
A machine have 75% efficiency means 25% of efficiency has been lost due to friction and a machine can work 75% only.
Answer:
Nutrients arw compounds in foods essential to life and heath
Answer:
have stars that might appear to wobble
often have one star that is brighter than the other
Explanation:
A binary star system is a star system made up of mostly two stars that moves round their common fixed center.
The two orbiting stars are gravitationally bonded to one another and they move round each other.
Most binary stars might appear wobble. One of the stars often appears brighter than the other.
Answer:
c. gold marbles because they have one type of atom
an element is a substance that is entirely made from one type of atom.
