Answer:
Each individual is a member of a population. Each population is made up of a group of individuals of the same species that occupy the same environment and interact with each other. Many different populations together make up a community, and many different communities interact with one another in an ecosystem.
Most important and abundant one are the phospholipids - amphiphatic molecules with an hydrophilic head and a hydrophobic hydrocarbon tails. They compose the membrane bilayer. Also important are the membrane proteins, which can be periheric and internal and can serve as channels, receptors, pumps etc.
Depending on the cell type the membrane can also contain cholesterol (in animal cells, enhances the membrane stability) or hopanes(in prokaryotes, same function as cholesterol) or ether-phospholipids with branched hydroharbon tails(in archaea, make the membranes more stable and resistant to severe conditions, as archaeas are extremophiles)
<span>The correct statement is letter C. All arteries except the pulmonary artery carry oxygen-rich blood. Most arteries are responsible for the delivery of oxygen and nutrients to all cells and the pulmonary veins are the one who transfer oxygenated blood from the lungs to the heart.</span>
200 seconds, or 3 minutes and 20 seconds.
1 km= 1000 meters
1000 meters divided by 5 meters every second, means that it’ll take 200 seconds to go that distance.
