The answer is B. alcohol crosses the barrier that the placenta creates
The placenta usually consist of several layers of cells that act as a barrier for the diffusion of substance that connect the maternal and fetal circulatory system that very important for the fetus' growth. But sadly, it can't block Chemical really well and alcohol can screw it u
Preserved footprints left behind by animals are called ichnites.
Answer:
English:
RNA and DNA are polymers made up of long chains of nucleotides . A nucleotide is made up of a sugar molecule (ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T).
Spanish:
El ARN y el ADN son polímeros formados por largas cadenas de nucleótidos. Un nucleótido está formado por una molécula de azúcar (ribosa en el ARN o desoxirribosa en el ADN) unido a un grupo fosfato y una base nitrogenada. Las bases utilizadas en el ADN son la adenina (A), citosina (C), guanina (G) y timina (T).
Answer:
Fascicles
Explanation:
Muscle fibers are arranged into bundles known as fascicles. These are in turn covered by connective tissue called perimysium.
