<h3><u>Answer;</u></h3>
B) a system is a group of objects analyzed as one unit
C) energy they moves across system boundaries is conserved
<h3><u>Explanation;</u></h3>
- System is a group of objects analyzed as one unit
.
- An open system is a system that freely exchanges energy and matter with its surroundings.
- A closed system is a system that exchanges only energy with its surroundings, not matter. An isolated system does not exchange energy or matter with its surroundings.
The answer to the question would be B since Nitrogen is the most abundant gas in our atmosphere
Answer:
Iron, copper , calcium
Explanation:
Iron , copper and calcium are present in three different groups.
Iron is present in group eight.
Copper is present in group eleven.
Calcium is present in group two.
Sodium , potassium and rubidium are present in same group i.e. group one. These are alkali metals.
Fluorine, chlorine and bromine are present in group seventeen. These are halogens.
Argon, Krypton and xenon are present in same group i.e, group eighteen. All are these noble gases.
Be more specific, I could possibly find the asnwer you're looking towards.
The Earth's core is the part of Earth in the middle of our planet. It has a solid inner coreand a liquid outer core.
