Answer:
Plants produce oxygen during photosynthesis, and they also need oxygen gas from the air for cellular respiration
Explanation:
Acceleration of a body is defined as rate of chance in velocity with respect to time and its S.I. Units are 
/ or 
Magnitude of average acceleration of a body = (final speed - initial speed)/time interval = 
where, final speed =v= 11 m/s; initial speed = u = 6 m/s; and time interval = t = 3 s
Hence acceleration = 
= 
= 
Answer;
-Helium atom
Explanation;
-An alpha particle is identical to the nucleus of a helium atom.
-Alpha particle is one type of particles emitted during a radioactive decay, others being gamma and beta particles. Alpha particles are produced during the process of alpha decay.
-When an alpha particle is generated during a radioactive decay, the mass number of the radioactive particle increases by 2 while the atomic number increases by 4.
Answer:
The oxygen atom is not balanced in the chemical reaction.
The dehydration is a very common problem seen in elderly individuals. At an elderly age, all the body functions are diminished, which lead to reduction in thirst and body's ability to obtain water. That is why, the elderly people are very susceptible to dehydration.
In order to remain healthy, a person must take 2.5- 4 litres of water per day. In males, the water is required more than females. So, for males, the adequate intake (AI) of water should be in between 3-4 litres per day.
