5-(FCC-BA) A proteção mecânica do embrião dos mamíferos é realizada fundamentalmente
a) pelo alantoide.
b) pela placenta.
c) pelo saco vitelínico.
d) pelo corsão umbilical.
e) pelo saco amniótico.​

What statements describe a host organism?

Kelly ran electricity though a sample of water using electrolysis. the water changed into two gases, x and y. it was not possible to break down the gases x and y into simpler particles.

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .