Define cell and atom bored​

Embryos of different species look very similar, which shows that the organisms share a ancestor.

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins