Unless is similar in meaning to if not and can be used instead of if not in certain types of conditional sentences. You won't get in to see the show, if you don't have reserved seats. Unless you have reserved seats, you won't get in to see the show.
Best Answer: Internal fertilization is when the sperm is directly deposited into the female, who produces eggs and fertilizes them in her body.External fertilization is when the sperm and eggs are released outside of the body and meet outside of the body, not like how chithra described.Birds do not have external fertilization, the fertilization still occurs in the body, they just do not produce live young.xternal fertilization is when the sperm and eggs are released outside of the body and meet outside of the body, not like how chithra described. Birds do not have external fertilization, the fertilization still occurs in the body, they just do not produce live young.
Internal Fertilization. The fertilization process occurs within the body of a female is called internal fertilization. It is a specialization for the protection of egg, but it depends on the birth method. Reptiles and birds have thick shell, covering the egg to protect it from dehydration and destruction.nimals such as mammals also have internal fertilization, where embryo develops inside mother, which enhances the protection to the embryo1. Internal fertilization facilitates the survival of the embryo, selective fertilization, and longer protection and minimizes the wastage of gametes.