Mammals did not descend directly from dinosaurs, but mammals embryos have placodes. Use the info about scales and feathers to explain why mammal embryos and dinosaur embyros each have placodes.

Which of the following is a main difference in cell structure between an onion cell and a human cheek cell? a. an onion cell contains one nucleus, whereas a human cheek cell contains two nuclei. b. an onion cell has a cell wall. c. a human cheek cell contains chloroplasts. d. there is no difference between an onion cell and a human cheek cell. you for your.

Forensic nursing is a medical-specialist career that grew out of a response to divorce in society. true false

Imagine you are introducing the lac operan and the trp operon to students who have never learned about it before. complete the table to compare the similarities and differences between the two operons