11.A is a group of persons related by blood, marriage or adoption. 12.The … is one example of a washing equipment
13. The efficient way of using available resources is known as …
14. Nature provides us with to chew our food.
15. The … carries the whole weight of the body.
16. One example of a household detergent is …
17. Some cleaning agents are
18. are used for collecting and carrying away dust from the floor.
19. Dirt is fixed dust attached to particles or surfaces by …
20.There are groups of laundry work equipment.

its mg hope this

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.