Human heart is a roughly triangular structure and a muscular organ. It is situated in the thoracic cavity between the two lungs. One third of its part lies on the right side and two third on the left side. An average human heart weighs about 300-350 grams which is about 12 cm long and 9 … Read more
The characteristics of this phylum are as follows: Presence of notochord Presence of dorsal hollow (tubular) nerve cord. Presence of pharyngeal gill slits. Post anal tail is present. Image source: kullabs This phylum is classified into four sub-phylum. They are as follows: Sub- phylum 1: Hemichordata Marine animals. Simple worm-like soft bodied animal. Remain buried … Read more