what factors contribute to past and present changes in california’s sea otter population?How do these changes affect other organisms living in the same ecosystem?

Human activities and water pollution.

Explanation:

The population of sea otter was 3000 in the past but by providing good environmental conditions, the population of sea otter increases up to 10000. There are some factors that contributed in the decrease in sea otter population in the past such as human interaction and pollution of water etc. Human activities and pollution also cause a bad affect on other organisms living in the marine ecosystem.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?