In which of the following groups of organisms is the sympatric speciation most likely to occur?
1. amphibians
2. arthropods
3. plants
4. birds

Jurassic period of the Mesozoic era is characterized by  
1. Gymnosperms are dominant plants and first birds appears.
2. Radiation of reptiles and origin of mammal like reptiles.
3. Dinosaurs become extinct and angiosperms appears.
4. Flowering plants and first dinosaurs appear. 

In sympatric speciation, reproductive isolation:
1. develops without a geographic barrier
2. develops due to a geographic barrier
3. is due to a change in chromosome number
4. does not lead to development of a barrier to mating

Evolution of life shows that life forms had a trend of moving from:

1. land to water

2. dryland to wet land

3. fresh water to sea water

4. water to land

Viviparity is considered to be more evolved because:

1. the young ones are left on their own

2. the young ones are protected by a thick shell

3. the young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival

4. the embryo takes a long time to develop