During the first month of development how many layers of cells make up the embryo

Which popular american sandwich is made by placing a beef patty inside a bun?is an american classic prepared by placing a fried or barbequed beef patty in a bun.

Which of the following is an important part of good posture? a. slumped shoulders b. arched back c. feet shoulder-width apart d. belly out

What is difference between an epidemic and a pandemic? a) an epidemic is a disease; a pandemic is a treatment.b) an epidemic is restricted to a local region; a pandemic is global.c) an epidemic has low mortality; a pandemic has higher mortality.d) an epidemic is caused by a bacterial infection; a pandemic is caused by a viral infection.