MAX POINTS...HELP ASAP (answer all right for crown 5 stars and thanks)

1a. Explain in English what function possessive adjectives serve in a sentence?

1b. Explain in English why “my, you, his, her, our, their, yall’s” are adjectives? How are these words descriptive of nouns?

1c. How do gender and number affect Spanish possessive adjectives? Please provide examples in Spanish along with their English translations.