Half life question: The table below shows the initial and final masses of a radioactive material whose half-life is 15 years. Initial mass (in kilograms) 0.8
Final mass (in kilograms) 0.05

Based on the table, which of these conclusions is correct?
A) The material decayed from 0.8 kilograms to 0.05 kilogram in 60 years.
B) The material decayed from 0.8 kilograms to 0.05 kilogram in 30 years.
C) The mass of the material was 0.1 kilograms after four half lives.
D) The mass of the material was 0.1 kilograms after five half lives.

the median of the data is 4.5.

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."    

they kick it to the curb.

explanation:

that current was nasty.

correct answer: false

while planning water activities, it is very important to consider the weather, because if we do not plan and are going for a surf, then it might be that the hurricane came and drown us or may carry us to long distance from where we can not come back. there are many reasons to take information about the weather when we are planning any water activities.

hence, the correct answer would be false.