Introduction Chordates are neither the most diverse nor the largest of the animal phyla, although in terms of the number of species, they come in a respectable fourth behind arthropods, nematodes, and molluscs. Chordates consist of three groups of unequal ...

Fertilization: The fertilization is a process of fusion of two types of sex cells (male and female) or gametes is known as fertilization. In other words fusion of sperm with ovum is known as fertilization. Fusion of sex cells in ...

Retrogressive Metamorphosis Retrograssive Metamorphosis is a peculiar types of metamorphosis which occurs in the life history of certain individuals, during development, certain characters of the advanced grade of organisation found in the larva completely disappear in the adult. It is ...

Introduction Breathing is the process of inflow and outflow of air between the atmosphere and alveoli of lungs. It consists two types of processes teemed as inspiration and expiration. Inspiration means the intake of air into lungs and expiration means removal of air from the ...

Reproductive cycle The reproductive cycle of male and female is a natural changes that occurs in the male and the female reproductive system respectively. Male reproductive system consists of a pair of testes (primary reproductive organ of male) which produces ...

Human Heart: The human heart is a muscular organ, which is present in the thoracic region of the human body. In this article you can understand about the structure, function and cardiac cycle of human heart in easy words. Shape ...

Snakes belong to limbless group (ophidia) of  class- Reptilia (Phylum–chordata). Most of the snakes are non poisonous and there are four poisonous genera of snakes, In India every year 30,000 persons die of the Snake bite. Snakes do not chew their ...

Digestion is the process in which chemical enzymes secreted from glands (liver, stomach, pancreas gall bladder) which break down the ingested food. Digestion process starts when we put food on our tongue. If you thick about it than you can ...