<u>Answer</u>:
The mass of a star can be determined by studying binary star systems.
<u>Explanation</u>:
In this system it consists of two stars, revolving round the same bary-centre. The systems having two or may say more than two are called as the multiple star system. This zone is also a habitable zone, here the water exists in the liquid form. We could have sometime seen the two stars together. They are also very capable of strengthening the terrestrial planets inside the stable orbital ranges. They have generally two orbits like P-type as well as circumbinary.
Chapter 3:
1. Her aunt created a doll out of towels and sowed eyes on the doll.
2. Dr.Alexander Graham Bell was a Scottish born scientist, inventor, engineer, and innovator who was credited with patenting the first practical telephone.
Chapter 4:
1. Because she is blind and deaf.
3. She lacks remorse/sympathy because she is blind and deaf and does not sense the environment.
4. When Miss.Sullivan arrived, Helen was taught to communicate through finger play. She was often frustrated and angry when she could not communicate.
the answer is Ocell because a cell is the building block of all things
Answer:
Nitrogen is an essential nutrient for plants and a significant component of proteins, which all animals need to grow, reproduce and survive. The nitrogen cycle converts nitrogen into compounds that plants and animals can use. Humans and Animals Need Nitrogen All human tissue – muscles, skin, hair, nails and blood – contains protein.
