<span>The correct answer is
(a) True, it is of paramount importance to use primary, secondary, and tertiary
sources in research. Researching includes using primary sources as they contain
original materials on which research is based, but also using second sources as
interpretations and evaluations as other researcher’s point of view. That also
apply for tertiary sources that
represent distillated and collected information of primary and secondary
sources.</span>
Answer:
The correct option is;
Glaciers that once covered South Africa have melted and can no longer form.
Explanation:
The Karoo Supergroup that formed hundres of millions of year ago covered the most part of South Africa. The Tillite debris from melting glaciers, in Dwyka Tillite are located at the bottom layers of the Karoo Supergroup, which is an indication that millions of years ago, South Africa was under extensive glacier coverage formed during the movement of the continent past the South Pole
The eventual arrival of the continent to temperate regions away from the South Pole resulted in the melting of the glaciers from which a huge swamp was formed.
Answer:
The ozone layer is being depleted due to CFC's. CFC's are found in aersoal spray cans and refrigants, when they are released into the atmosphere it causes depletion of the ozone layer. Humans are the one who made the CFC's, causing the ozone layer to deplete, even though they have been banned now, a lot of damage has been done.
Answer from Gauthmath
The possible scenario for singing traits in female birds will be about 26% in Generation 4 species
Explanation:
Singing trait have been common among both male and female birds and it is an ancestral traits. However, singing has been more sex-specific with male birds. Reasons for which birds generally sing are:
- To attract the mates
- While making nests and laying eggs
- For the young birds to recognize their parents
However, various studies prove that the singing trait in female birds is reducing with increase in non-singing female birds over the years due to evolutionary course.
