Fill in the blanks :
The onset of menstruation is called_________.
Menarche
Mention one significant difference between each of the following :
Calyptra and Calyptrogen
Mention one significant difference between each of the following :
Xerophthalmia and Night blindness
Mention one significant difference between each of the following :
Holocrine and Apocrine glands
Fill in the blanks :
The process of purifying blood by means of an artificial kidney is called________.
Mention one significant difference between each of the following :
Fertilisation and Insemination
Fill in the blanks :
The stage in the embryonic development which consists of a solid ball of cells is called__________.
Fill in the blanks :
The determination of the age of a tree by counting the annual rings is known as__________