Why the scientists decalcify the bones?

2

(a)

What is the unique feature of cardiac muscles?

2

(a)

Cardiac muscle tissues have both character of skeletal and smooth muscles, how? Explain.

2

(a)

Malphigian tubules are proto structure of nephron. How?

2

(a)

Differentiate between male and female cockroach.

2

(a)