Which of the following is expected to occur if a keystone species is removed fram an ecosystem? a. a niche is eliminated b. competition is reduced c. other speciesmove toward stable populations d. the ecosystem collapses

Lesson 7: Population Changes Due to Organism Interactions

1. Species B is the predator of species A.

2. B. The vegetation it eats increases and then decreases repeatedly with changing seasons.

3. B. The deer population will increase, and will strip the vegetation to become overgrown.

4. D. The ecosystem collapses.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.