In which trimester does the following occur? the enbryo is attached to the placenta by the umbilical cord, and the placenta makes contact with the uterus

Which of the following are examples of coordinate headings

Will treating a viral infection with antibiotics affect the course of the infection? a) no; antibiotics work by inhibiting enzymes specific to bacteria. antibiotics have no effect on eukaryotic or virally encoded enzymes.b) no; antibiotics do not kill viruses because viruses do not have dna or rna.c) yes; antibiotics activate the immune system, and this decreases the severity of the infection. d) yes; antibiotics can prevent viral entry into the cell by binding to host-receptor proteins.

The type(s) of air pollution you will be discussing