Answer:
The cell membrane has two functions: first, to be a barrier keeping the constituents of the cell in and unwanted substances out and, second, to be a gate allowing transport into the cell of essential nutrients and movement from the cell of waste products.
Explanation:
The law of half diabetes i dont know I’m sey
Answer:
The correct answer is "17,100 years".
Explanation:
Carbon-14 is a radioactive isotope of carbon that is normally present in all living organisms and due to its low content and slow pace of degradation it is widely used for dating purposes. The half-life of Carbon-14 is approximately 5,700 years, therefore, a wood that had gone through 3 half-lives of Carbon-14 will be approximately 17,100 years old. This calculation is made simply by multiplying three times the half-life of Carbon-14.
Explanation:
Tropical rain forests are one of the densely vegetated forests with millions of plants and animals species. The climate of the Earth is changing at an alarming rate and the scientists are appealing people to save these forests.
This could be accounted for the reason that the tropical forests have a diversity of plant species which can utilize the available carbon dioxide from the atmosphere to perform photosynthesis. This can directly reduce the carbon dioxide concentration in the atmosphere which is responsible for the greenhouse effect.
The greenhouse effect increases the temperature of the Earth as the greenhouse gases like carbon dioxide and monoxide covers the atmosphere which does not allow the sun rays to deflect back from the surface of the earth and the heat energy is trapped in the atmosphere. This heat energy is one of the causes of Global warming.
Plants are photosynthetic. So, they prepare their own food by using raw materials from atmosphere like CO2, H2O and sun’s energy. CO2 is the carbon source for the synthesis of glucose through array of enzyme catalysed biochemical reactions taking place in chloroplast of plant cell.
Animals are heterotrophic in nutrition. So, they get energy; i.e. glucose from the food they eat. It depends on what is their food source. For example, herbivorous animals eat variety of plants, starch and cellulose of which become glucose source. Carnivorous animals eat other animals, whose stored glycogen or fat becomes energy source for them.