Biological evolution is the process by which populations of organisms change over time. How could natural selection lead to the evolution of a species?
Answer:
gain; presence
Explanation:
The Ames test is a lab methodology used to determine whether a particular chemical substance can trigger mutations in an organism, which can be used to indicate whether exposure to the target chemical compound is associated with a greater risk of developing cancer. The Ames test can use a strain of <em>Salmonella typhimurium</em> carrying mutations in a key gene that encodes a protein involved in histidine biosynthesis. In consequence, this <em>S. typhimurium</em> strain is considered to be a 'histidine auxotroph' which is unable to synthesize histidine residues. After exposure to the target chemical compound, bacteria are then cultured in a medium lacking histidine. Subsequently, bacteria that regain the ability to synthesize histidine proliferate to form colonies. Finally, the number of these colonies is then compared with the number of mutants in absence of the potential mutagen, enabling thus the determination of the mutagenic potential of the target chemical compound.
Answer: Nutrient pollution is caused when too many nutrients, primarily nitrogen and phosphorus, are added to water bodies. The excess nutrients act as fertilizers, causing excessive algae growth. It is common for nutrients to run off the land in urban areas, where lawn and garden fertilizers are used.
Explanation:
I explained in the top-
Hope it helps if it doesn't then whooops
Answer: slow changes in the ecosystem can be great because then there is a higher chance of less rapid spikes in the ecosystem of pollution, carbon dioxide in the air, and chemicals that aren't good for us.
Explanation: