About 60% of natural conceptions fail to implant properly. One of the reasons may be the failure of the embryo to generate Trypsin, a chemical which induces a receptive environment in the uterus in order for the fetus to be implanted. The excess or lack of chromosomes of the fertilized egg may also be a factor in implantation failure. A weak immune system of the woman may also be an important factor.
The correct answer is C - carbon dioxide.
The distribution of gases in the earth's atmosphere is as follows:
1. Nitrogen - 78 %
2. Oxygen - 21 %
3. Argon - 0.93 %
4. Carbon dioxide - 0.038%
Nitrogen, oxygen and argon are permanent gases whose percentage in the atmosphere does not change from day to day.
Gases such as carbon dioxide, nitrous oxides, methane, and ozone are known as trace gases which make up 0.1% of the atmosphere.
Answer: ultrasound
Explanation:
reflection of sound method
Answer:
Explanation:
The descriptions describes some of the events that takes place in the mitosis and meiosis cell division process.
A cell divides to produce two daughter cells that are genetically identical. ____. This describes mitosis
Homologous chromosomes synapse and crossing over occurs. ____ . this happens in meiosis I only
14. Centromeres uncouple and chromatids are separated from each other - this happens in mitosis and meiosis II.
15. Independent assortment of chromosomes occurs. _ this happens in meiosis I only.
16. The process is preceded by replication of the DNA. ___. This happens in mitosis and meiosis II.
Hi,
Take a look at your periodic table. Fluorine is in group 17, and by its electron configuration you can see that its outer electron shell needs only one electron to be complete. For this reason bonding with an element that can donate a single electron is the optimal option.