In bird, females are heterogametic, produce two type of gametes. The two different sex chromosomes of a female bird has been designated to be the Z and W chromosomes. Whereas males have a pair of Z- sex chromosomes. Males are homogametic produce only one type of gametes with Z-sex chromosomes. Thus sex determination is ZW-ZZ type. In humans sex determination is XX-XY type. Males are heterogametic produce X and Y gametes and females are homogametic produce one type of gametes. Therefore, in bird sex are determined by female gametes.
Answer: C, matter is changed into various forms but the total quantity remains unchanged.
Explanation: The Law of Conservation of Matter directly states that in any food chain, matter is not lost, but conserved.. (hence the name). Thus, matter may decompose, or be digested, but it is never completely destroyed.
For example: When you burn a log, the log still turns into ash.
Hope this helps,
LaciaMelodii :)
