The chlorophyta are important FOR PROVIDING OXYGEN TO THE ATMOSPHERE.
Chlorophyta refers to the division of lower plants, which is made up of green algae. The plants are aquatic and they found majorly in fresh water and marine habitats, although some are found living on land. Chlorophyta serve as an important source of food to marine organisms and they play a very significant role in contributing to the world's supply of oxygen through the process of photosynthesis.
Protein mainly in the form of Keratin makes up 90% of the dry matter in the feathers
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As stated, the students were there in the lab for performing practical without following the safety rules. The most likely basis for teacher's warning here in this case is the flask which is pointed in an unsafe direction. It is not mentioned whether the flask is containing any chemical or not but even if it is empty, it might just fall and break and cause injury to anyone present in the lab because the students are also not wearing proper laboratory wear in accordance to the the safety rules which include lab coats, gloves, eye wear, etc. Also, some students have not tied their hair and more importantly the flasks containing liquids are not labelled. All of these things might end up in a dangerous situation for which the teacher warned students about it all
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If we are watching the sky, we see the lightning before we hear the thunder. That is because light travels much faster than sound waves. We can estimate the distance of the lightning by counting how many seconds it takes until we hear the thunder. It takes approximately 5 seconds for the sound to travel 1 mile.
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