The 3 types of scientific investigation are correlative,comparative, and descriptive
The exchange takes place in the millions of alveoli in the lungs and the capillaries that envelope them.
They live in the Winter climate
<span>The question says, 'during embryonic development, if the anus develop before the mouth, the organism is a ............ The correct option is B. In deuterostome during embryonic development anus develops first from or near embryonic blastopore, mouth develops later at some distance from the blastopore or from the opposite end.</span>
