a) Natural Selection
The moths that were lighter stood out on the dark bark, becoming easy targets for pray and eliminated light gene pools.
During early civilization, the main source of fresh water was from a river. Nowadays, we have reservoirs and lakes to get fresh water. <span />
They are both eukaryotic cells. They both contain membrane-bound organelles such as the nucleus, mitochondria, Golgi apparatus, lysosomes, etc.
If the number of observations is even, then the median is defined as the average of the two middle observations<span>. Median is a measure of central tendency, it depicts the middle value in a given set of numbers. To find the median, the data should be arranged in order from least to greatest. If there is an even number of items in the data set, then the median is found by taking the mean or average of the middlemost numbers. If there is an odd number of results or items, the median is the middle number.</span>
