Answer:
C
Explanation:
Because pure oxygen cannot be absorbed by the lungs unless diluted or adding extra oxygen to it .
Explanation:
Environmental factors influences greatly in natural selection and genetic diversity. The environmental conditions can be change in temperature. The animals or plants living in an area have to adapt themselves during the change in environmental conditions.
And also when the limiting factor exists, the organisms have to compete with each other and whatever organism is able to sustain in that factor are able to make up a population and this is called as natural selection. Natural selection leads to genetic diversity.
The following leading causes are the reason behind the death of various sportsmen during the boating activity:
1. Not wearing a life jacket: Sportsmen or the skilled swimmers are most likely to ignore this while boating as they trust their skills more. This leads to a fatal mishap.
2. Boat not loaded uniformly: If the weights on one side of the boat do not balance that of the other side, then there is a high chance of the boat flipping over. The boat can trap the person inside it to drown them.
3. Boating in strong current river: Boating in areas with strong currents can increase the chances of the boat flipping over. The strong currents make it hard to swim ashore.
4. Boating in unsafe places: Animal attacks like that of the box jellyfish or the shark can lead to the death of the sportsperson.
The causes vary from location to location but all of them lead to the drowning of the sportsmen.
Answer:
It allows the transport of specific substances across a cell membrane
