The density of a population of living organisms is usually measured in individuals on one square km. In here we have 50 earthworms on an area of 5 square meters, thus we have 10 earthworms on every square meter. In order to get to the result we need to see first how many square meters there are in one square km. One square km has one thousand meters of length and one thousand meters of width so:
1,000 x 1,000 = 1,000,000 km²
Since we established that we have 10 earthworms on every one square meter, we just need to multiply the number of square meters with the amount of earthworms on every square meter:
1,000,000 x 10 = 10,000,000
So we have a density of 10 million earthworms per square km.
This question is incomplete as no options are given. However, urbanisation typically leads to a greater percentage of impermeable surfaces, such as roads, parking lots etc. Water is then unable to filter into the soil and groundwater as much as it would on natural land. What then occurs is much more runoff in urban areas during rainfall. This has been problematic in major cities in the developing world, where storm water drains are not maintained. Rainfall can easily result in flooding, and floods can be much worse in urbanised environments. We must also consider that there will be reduced groundwater recharge in urban areas from rainfall, as less water infiltrates the soil. Interestingly, in urban areas, it is generally accepted that up to 60% of tap water is lost through leaks, many underground, so groundwater may be recharged through lost tap water.
An example of a long food chain from the animal world. . .
Here's a simplified food chain with six links. You could add humans on to the end if you apply us to the term 'animal world' too.
Phytoplankton
This question and the statement is True.
It is a very normal and common for male and female to be with their friends. But it will be a lot a harder for male and female with their friendship to be Platonic especially if the male and female is the heterosexual.
Explanation:
Enzyme activity can be affected by a variety of factors, such as temperature, pH, and concentration. Enzymes work best within specific temperature and pH ranges, and sub-optimal conditions can cause an enzyme to lose its ability to bind to a substrate.