In the production of female gametes,which of the following cells can remain dormant for 12 to 40 years?
A、Primordial germ cell
B、Primary oocyte
C、Secondary oocyte
D、First polar body
A、Primordial germ cell
B、Primary oocyte
C、Secondary oocyte
D、First polar body
The purpose of this device is to .
A、remove condensate from a steam piping system
B、automatically reduce liquid pressure in a pipline
C、relieve excess pressure from a boiler or pressure vessel
D、protect drinking water from contamination
A、Primordial germ cell
B、Primary spermatocyt
C、Secondary spermatocyte
D、Spermatid
A、20 million
B、35 million
C、100 million
D、350 million
A、40,000
B、35,000
C、480
D、48
A、Prophase of meiosis I
B、Prophase of meiosis II
C、Metaphase of meiosis I
D、Metaphase of meiosis II
A、During fetal life
B、At birth
C、At pubery
D、With each ovarian cycle
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