1. Hollow ball of cells implants into uterus II. Major organs develop III. Final growth and differentiation IV. Sperm fertilizes egg Which of the following answer choices sequences the events of human development listed above in the correct chronological order? Choose 1 A 11 → IV I III B IV> 1 II-III C 1 IV -> 11 - III D IV-1 - III

Based on the observation that only male crickets produce a song, you hypothesize that a male's song is a form of communication to potential mates. you set up a simple experiment to test this hypothesis. in the laboratory, you place a male snowy tree cricket in enclosure a, which is adjacent to enclosureb. in enclosure b, you place other insects, one at a time, and observe their responses to the male's song. the enclosures are designed so that the two insects being tested cannot see or smell each other, but sound is transmitted from enclosure a to enclosureb.