The correct option is A.
Multicellular organisms are made up of many different cells. Each type of cell perform a unique basic function which another type of cell can not perform. Cells are usually equipped to carry out their functions by their components, structures and sizes.
Answer:
why k how to do this im only in 1st grade now wheres my brain
Explanation:
Climate change
Drought and other extreme weather events
Lack of emergency plans
Answer:
How the heart works
The heart is a large, muscular organ that pumps blood filled with oxygen and nutrients through the blood vessels to the body tissues. It's made up of:
4 chambers. The 2 upper chambers are the atria. They receive and collect blood. The 2 lower chambers are the ventricles. They pump blood to other parts of your body. Here is the process:
The right atrium receives blood from the body. This blood is low in oxygen. This is the blood from the veins.
The right ventricle pumps the blood from the right atrium into the lungs to pick up oxygen and remove carbon dioxide.
The left atrium receives blood from the lungs. This blood is rich in oxygen.
The left ventricle pumps the blood from the left atrium out to the body, supplying all organs with oxygen-rich blood.
4 valves. The 4 valves are the aortic, pulmonary, mitral, and tricuspid valves. They let blood flow forward and prevent the backward flow.
Blood vessels. These bring blood to the lungs, where oxygen enters the bloodstream, and then to the body:
The inferior and superior vena cava bring oxygen-poor blood from the body into the right atrium.
The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.
The pulmonary veins bring oxygen-rich blood to the left atrium.
The aorta channels oxygen-rich blood to the body from the left ventricle
Tundra biomes are either found at high latitudes or high elevations in mountains. These are both very cold environments that are dominated most of the year by snow and icy conditions. This in itself tends to stunt plant growth.
These regions, especially, tundra in the high latitudes also have very short growing seasons (3 months perhaps) and so plants can only photosynthesize and store sugars for this amount of time. High winds in these environments also tend to keep plants low to the ground.