Which of the following is responsible for the continuity of life and the maintenance of species?

Identify the correct sentence.

........ and ........ are examples showing external fertilization.

Which is a better mode of reproduction: sexual or asexual? Why?

The most common method of asexual reproduction is by

In a practical test, a student has to identify the organisms in which syngamy does not occur. In those organisms, the female gamete undergoes development to form new organisms without fertilization. This phenomenon is called "$X$". Identify the organisms and the phenomenon "$X$".