Answer:
Red algae - acquired plastids by secondary endosymbiosis
Explanation:
Red algae are believed to have undergo a primary endosymbiosis event. Then a second endosymbiosis event created a large group known as heterokonts. During the primary endosymbiosis event red algae acquire their plastids.
Answer:
cooler denser air produces an area of higher air pressure and moves in under rising air
Explanation:
Answer:
- <u>a review of published literature (secondary data collection)</u>
- <u>carry out interviews</u>
- <u>perform a survey</u>
Explanation:
1. <u>Review published literature:</u> This method involves reading through already published works containing meaning data about the particular field of study. For example, you read through textbooks, past newspapers, magazines, academic papers, etc.
2. <u>Carry out interviews:</u> This simply requires face to face or a virtual one on one interactive session with your respondents in other to record the data they provide.
3. <u>Perform a survey:</u> A survey here implies that issuing out a paper-based questionnaire or an online questionnaire (form) to be filled by the subjects of the research.
The correct answer is : Its risks outweighed the benefits.
The DDT is an colorless, tasteless chemical compound which was originally developed as an insecticide.
DDT was used during second world war to control malaria among the troops and the civilians.
Later, it was used as pesticide in agricultural and household practices. Due to its excessive use it entered into the food chain and its amount in the food crossed the permissible level.
So, it was banned by United States.