Final answer:
Children make fewer mistakes when learning English because of their biological predisposition to language acquisition and constant interaction with their parents.
Step-by-step explanation:
Children tend to make fewer mistakes when learning English than adults learning a second language due to a combination of biological and environmental factors. Young children are biologically predisposed to acquire language easily, known as the critical period for language acquisition. They have an innate capacity to learn language and quickly develop an understanding of grammar rules. Additionally, children are often exposed to language through constant interaction and reinforcement from their parents, which helps them learn language more effectively.