Radioactive isotope with long half life would be the way to date a sample of rock that you suspect as being one of the earliest on Earth. Archaeologists very often use this method for checking the dates of the materials they excavate. I hope that this is the answer you were looking for and it has come to your help.
Answer:
D. Pollution
Explanation:
The pollution is a consequence of the growing economy in advancing nations. The economy is growing, and transforming rapidly in the last two decades. Some characteristics of this change are: technological innovations and modernization, competition in the global market, etc. However, the pollution still a severe problem in developing countries. This is because, these countries doesn´t have a substantial economic growth, therefore cannot afford to focus on environmental problems.
Developing countries need to decide between keeping competitive prices to obtain and sustain economic growth while the poverty decrease. This decisions usually lead to environmental pollution. For example In sub-Saharan Africa, depends mainly on natural resources. They over exploits of natural resources such as coal, oil and gas, gold, copper. This cause pollution in air, water and land, and it can impact the climate change.
They should care more about pollution, because it also affects the health, sometimes leads to death of the population. Is important to mention that per year millions of people can be affected.
Answer:
Yes, B is correct
Explanation:
Another answer that isn't on there would be how local businesses cannot compete with overseas producers.
Answer:
a) Yes! the American chestnut tree is a native species. The American chestnut tree was present before the Europeans arrived in North America in the 1600s. Since a native species has been defined as any species that was present in North America before the arrival of the Europeans, then it is a fact that the North American chestnut tree is a native species.
b) The chestnut blight is an invasive species that is native to east East Asia, and was accidentally introduced into North America around the early 1900s, when the Japanese chestnut was commercially cultivated in the United States.
c) Invasive species tend to proliferate at a very high rate because they lack some natural constraints in the new environment such as natural predators, competition, and as in the case of this chestnut blight; the host has no natural defense mechanism against them. These conditions allow them thrive more than they would in their natural environment, unchecked
d) Yes, I agree with this idea, albeit to some extent. The development of hybrid chestnut resistant to the chestnut blight will possibly return the forests back to how it was before the Europeans arrived in the 1600s, but the genetic conservation will be altered, since these new trees will be an hybrid of the old trees, and the forest won't truly be as it was before the 1600s
