Probably molecular biology. Scientists have been able to look at organisms and compare them visually for rather a long time, but only recently have we been able to sequence genomes and compare organisms at the molecular level.
brain is the organ which does play a role in mechanical or chemical digestion
It is called ecological succession, which can take up to a decade. It is a process of change in the species structure that occurs after a vast loss or extinction. Ecologists study how complexity is evident when a community is formed or occurrence takes place from an empty land or bare soil.
The first one answer is to be increased and the second one answer is to be decreased
Holmes said to Watson "My dear doctor, this is a time for observation, not talk, because it was part of his method to observe closely and then to consider his observations. The correct answer is A.