The Haversian system is a characteristic feature of which of the following?

Select the correct sequence of biological organization in complex animals.

Which of the following is a common feature between cockroaches and earthworms?

How many of the given statements are true?
$A.$ The dry surface of the skin and the moist surface of the buccal cavity are lined by compound epithelium.
$B.$ Cuboidal epithelium facilitates diffusion across the epithelium.
$C.$ Intercalated discs are the cell junctions between the cardiac muscle cells.
$D.$ Skeletal muscle fibers can be located in the biceps muscle.
$E.$ In a bone,osteocytes are located in lacunae.

Which one of the following lists contains only mesodermal structures?

Read the following statements about cockroach :
$(a)$ In male cockroach a characteristic mushroom shaped gland is present in the $6^{th}-7^{th}$ abdominal segments which functions as an accessory reproductive gland.
$(b)$ Cockroach is uricotelic.
$(c)$ The fat body and uricose gland help in excretion.
$(d)$ Blood from sinuses enter heart through ostia and is pumped anteriorly to sinuses again.
Which of the above statements are correct?