In English: The indefinite article is used for pen, book and notebook, since they are words. the, masculine the, feminine the and the, feminine and masculine
Answer: 1) diverse groups of animals evolve from one or a few common ancestors; 2) the mechanism by which this evolution takes place is natural selection.
Explanation: i dont know if this helps or not but hopefully it does
Because breakfast is a light meal
La is the definite article for feminine nouns. Ex: La Fruta: The Fruit (Note: la and fruta both end in "a". That's how you know it's a feminine noun.)
For El it is the definite article for masculine nouns. Ex: El Libro: The Book (Note: for el, nouns end in "o")