The correct answer is: a. using a photographic negative to make a positive image
A negative image is a total inversion of positive image (normal image). Negatives are normally used to make positive prints.
This can be compared to copying mechanism of DNA-replication of DNA in which one strand of DNA (e.g. 3’-5’ orientation) is used as a template to make new strand with opposite orientation (5’-3’).
Different cells in the body preform task
The correct answer is c. Heterotrophs compete for the same food source.
As it can be seen from the image of the food web, the tree or plants which are autotrophs are consumed by various heterotrophs. Autotrophs provide as a source of food for several heterotrophs but several heterotrophs depend on other heterotrophs such as smaller insects or animals for their food. As shown in the food web, both frog and lizard are consumers of insects so both being heterotrophs are competing for the same source of food which is insect here.
They can have six to nine puppies but the average amount is seven.
Answer: Option (B) is the correct answer.
Explanation:
A salt bridge in an electrochemical cell helps in maintaining the electrical neutrality at both reduction and oxidation half cells. It helps in the flow of electric current by maintaining the neutrality of the ions.
Similarly, in a dry cell the paste acts as an electrolyte which helps in the flow of electric current.
Thus, we can conclude that paste is the parts of a dry cell corresponds to the salt bridge shown in the diagram.
