There are different materials of raw water, but also the raw water comes from ponds,rivers, and oceans but they might be good sometimes, and gas not been treated and has bacteria or mold buy that is not good.
Two atoms of oxygen element are represented as "20". The two oxygen atoms are unreactive state and are unstable readily reacts and form molecules.
O₂ reprersents one molecule oxygen. When the two oxygen atoms reacts with each other forms one molecule of Oxygen. After the formation of Oxygen molecule, it (oxygen) has got stability.
Answer: Gene Pool
Explanation:
Gene pool is the collection of all the gene and various allelic form of those gene within a population.
Variation naturally occurs among the gene of members of the same species that interbreed.
Gene pool It is therefore the total number of gene of all the members among the population of a particular species. Gene pool is used to determine the level of mutation, variation, genetic diversity among members of a population.
I can’t answer how lichens arrive in a barren landscape but I can answer the 2nd part
Lichens grow when exposed to water. When wet, lichens begin to photosynthesize.
Answer: Option C) Root hairs have an elongated shape that increases the surface area-to-volume ratio.
Explanation:
The larger surface area-to-volume ratio of root hairs enables them to rapidly absorped water molecules and nutrients along their elongated shape while aiding their upward transport from the root up the shoot (through the xylem vessels).
