Sperm of animal species `ul(a)` cannot fertilise ovum of species `ul(b)` because

Sperm of animal speciea a cannot fertilise ovum of species b because

Sperm of animal speciea a cannot fertilise ovum of species b because

Sperm of animal species A cannot fertilize ovum of species B because .

Sperms of one species fail to fertilize the ovum/ova of other species. Give reason.

Why do sperms of one species fail to fertilize the ovum/ova of other species ?

In an ecosystem, the species composition is determined by (a) Identification of plant species (b) Identification of animal species. (c0 Enumeration of plant species (d) Enumeration of animal species

Animal species should be protected because they are