The graph shows the atmospheric levels of carbon dioxide. The Y-axis is atmospheric carbon dioxide levels in parts per million and runs from 310 to 410. The x-axis is marked in 10-year increments from 1960 to 2010. A zigzag line shows the monthly values. A high point is about 80 parts per million greater than the adjacent low points. There are 10 high points and 10 low points per 10 –year period. A straight line through the center of the zigzag line shows normalized values. In 1958, the level of atmospheric carbon dioxide was about 315 parts per million. In 2016, it was about 415 parts per million.

How have human activities contributed to the trend in the data shown in the graph?

A. Atmospheric carbon dioxide levels have remained steady because natural processes have balanced out human activities.
B. Atmospheric carbon dioxide levels have increased because the increasing human population exhales a greater volume of carbon dioxide.
C. Atmospheric carbon dioxide levels have increased because the burning of fossil fuels releases heat, which causes carbon dioxide to evaporate.
D. Atmospheric carbon dioxide levels have increased because the burning of fossil fuels releases carbon that otherwise would remain in the geosphere.

a.) a destruction fo cells by viral reproduction

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.  

for example:  

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer.   you start to feel bad.