In sponges, fertilisation is (A) and development is (B) having a larval stage which is morphologically (C) the adult.

Select the option that correctly fills the blanks A, B and C.

	A	B	C
1.	internal	indirect	distinct from
2.	internal	indirect	similar to
3.	external	direct	distinct from
4.	external	indirect	similar to

• A

  1

• B

  2

• C

  3

• D

  4