Answer: A closed circulatory system and an excretory system consisting of tubular nephridia
Explanation:
<span>50 percent. Newborn has very low listening ability and learning as brain develops the child will learn new things and his brain starts to grow big .Brain will adapt the language,color ,light,people faces and then child will learn fast</span>
Answer:
Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population.