Special characteristic of the respiratory membrane is very thin diffusion membrane.
The respiratory membrane allows gases to be exchanged-oxygen goes in and carbon-dioxide goes out from the body. That process is called diffusion and follows the laws of partial pressure (<span>movement of a gases from a high to a low concentration)</span>.
The metaphase is the second stage of cell division when chromosomes attach to the spindle fibers
Answer:
Be
Beryllium
Explanation:
number of protons = atomic number.
number of electrons = atomic number
"In the early days of germ theory, contagious diseases
were thought to be caused by fungi or bacteria. In the 1890's, Dmitri
Ivanovski filtered extracts from diseased tobacco plants and discovered
that the disease could be transmitted to new plants through the
filtrate. He concluded that the disease was caused by particles smaller
than bacteria; the tobacco mosaic virus", is partially correct. Dmitri
Ivanovski discovered that filtered extracts from diseased tobacco plants
could be transmitted to new plants through the filtrate. However, it
was Dutch microbiologist Martinus Beijerinck who, while replicating
Ivanovsky's experiments, proved that the filtrate contained a new
infectious agent. Beijerinck named this agent a virus.
