How do you think carbon might be considered young, old or ancient

a tetrad is the foursome during meiosis made by two homologous chromosomes that have each already replicated into a pair of sister chromatids.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

answer; both surfaces of the membrane are nonpermeable