Which of these describes the skin of frog?

Which of these statements is true with respect to the anatomy of frog?

Microvilli is present in the epithelium of ___

Which of the following is not true about nephridia in earthworm?

The epidermal pits in the middle of each segment of the earthworm contains _____

By which of the following do frogs do not respire?

How many ganglia lie in the thorax and abdomen respectively in cockroach?

Which of these structures is present in male cockroaches only?