¿Cual de las siguientes especies se reproduce por fecundación interna ?

(a) Los gatos
(b)Los sapos
(c)Los peces
(d) alternativa b y c

Which of the following species reproduces by internal fertilization?

a) cats

(b) Toads

(c) The fish

(d) alternative b and c

(a) Los gatos

Explanation:

Only cats are capable of internal fertilization from the given choices above.

Internal fertilization is the fusion of gametes within an organism. This process occurs during sexual reproduction within the female.

In cats, the female specie takes in reproductive cells from the male during coitus and it fertilizes the her eggs to produce a zygote.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.