The human population started to rise perceptibly at around 1800 BC. The numbers begin to rise dramatically about 200 years ago. What causes these changes? Revolutions! There have been several: agricultural, health, industrial, green, Farming developed about 10,000 years ago. Farming meant a steady supply of food and people could settle in villages instead of wandering after their food. The rise at around 1800 BC is due to increased farming and the rise of cities and towns. Then around 1800 AD, the population begins jump. Why? Health care has been improving over the last two centuries. Vaccines were developed that could prevent many diseases and antibiotics were discovered that could cure most infections caused by bacteria.
In the 1700's, the Industrial Revolution changed the source of power from humans to fossil fuels. This allowed more work to be
done.

The Green Revolution followed in the mid-1900's and continues today. The Green Revolution has allowed billions of people to be added to the population in the past few decades through advances in agriculture. How are the Industrial and Green Revolutions
connected?

A)
Increasing access to water: building more dams to provide a water source
for crop irrigation.

B)
Increased use of genetic engineering: Improving crops by selecting for
certain genetic traits.

C)
Increased use of agricultural machinery: plowing, fertilizing, picking, and
transporting using machines are powered by fossil fuels.

D) Increased use of inorganic fertilizers and chemical pesticides to maximize
crop production on a given amount of agricultural land.

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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i would say it is

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.

it should be d) transitional fossils.

they show the gradualism of evolution throughout a period of time