Which of the following species is an r-selected species?
a.
giant tortoises
b.
mosquitoes
c.
elephants
d.
redwoods

The correct answer is- b) Mosquitoes.

R- selected species are those species that can survive in unstable, unpredictable environmental conditions and produce large number of small size offspring. These offspring have low survival rate ( short life span) and do not have any parental care.

These species grow very rapidly and attain reproductive maturity at early stage in their lives.

Example of R- selected species- Insects ( such as mosquitoes), rats.

On the other hand, a) , c), and d) are K selected species. They survive under stable environmental conditions and produce large size offspring with very few number. They have long life span and experience parental care

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.