Answer the following questions as requested. (17) Why are hormones called chemical messengers? (18). For what purpose is the study of fossils important? (19) What are ear shoes? What is the dominant and latent expression following it? (20) Compare two currents of 50 volts and 10 volts in series by comparing the currents flowing through them. (21)Write two uses of solar cell for space science. (22)Who is most affected by the environment? (23) Name the main constituents of coal and petroleum.
Answers
Answer:
Hormones are called chemical messengers because they are chemical agents that go around the body to tell particular cells to play out a specific action. The term hormone depicts an assortment of chemicals that perform these signaling tasks. ... The body has an endocrine system that contains several glands.
Explanation:
Answer:
17 ) Hormones are called chemical messengers because they are chemical agents that go around the body to tell particular cells to play out a specific action. ... Hormones can go from proteins to amino acids to steroids. The body has an endocrine system that contains several glands.
18) Answer: Studying fossils helps them learn about when and how different species lived millions of years ago. Sometimes, fossils tell scientists how the Earth has changed.
19) Ear shoes are nothing kind of thing in the world because shoes are to be worn in our legs while in ear the necklace is to worn so please edit this question.
20) V = IR Here resistance is constant so 50/R = I and 10/R = I
Here The 50 volts current is flowing with more current the 10
21) Solar cells are used to convert light source from the sun into electrical energy. This is environment-friendly and saves resources. Solar cells are used in power farms to provide electricity to large areas. Solar cells used in vehicles like cars, buses etc.
22) JAPAN (Climate Risk Index: 5.5)
23) Carbon nitrogen hydrogen sulphur.