Answer: Option D is the correct answer.
Explanation:
Animals are not the first to colonize land. Prokaryote are probable the first organisms to colonize land. They have been existing about 2.6 billions years ago. Fungi have been in existence long time ago. Study reveals that they have been living in aquatic habitat before coming to colonize the land.
Answer:
Explanation:
Denitrification is the process the converts nitrate to nitrogen gas.
Hydroxyapatite is the major component of bone that contributes to its hardness.
It should be due to the changes in the water temperature and the salinity of the water.
Answer:
?? I don't know what these means
