Why does Maya Angelou repeat stanza 3 and 5 in caged bird

What would happend if organ systems failed to work together

The development of new inventions in the field of space travel seemed rapid. how does the word rapid function in a sentence?

Which sentence uses the simple present tense of sleep? mr. ford sleeping on a feather mattress in his apartment. mr. ford will sleep on a feather mattress in his apartment. mr. ford sleeps on a feather mattress in his apartment. mr. ford slept on a feather mattress in his apartment.