Answer:Algae play significant roles as producers in aquatic ecosystems. Microscopic forms live suspended in the water column. They are the main component of phytoplankton. As such, they contribute to the food base of most marine ecosystems.
Explanation:
Will I think that maybe true
Proximity is the factor that determine where the illegal immigrants settle. The country like United States, has so many illegal immigrants that hope to have a better life in the country, they risk their life just to have money in the country because they know that country is rich so they migrate in the United states.
Answer: Longitudinal research
Explanation:
Longitudinal research is the research study that is carried out by the researchers through observation technique. Information and sample are collected on the same project over a time period to observe any kind of change.
These researches can take huge amount of time such as may years to notice the alteration on the repeated observation.This study is carried out on the same individual or same group of individuals s the subject.