It depends on the particular ecosystem and why and how it was destroyed. It can take just 2 years or over 100 years depending on the different factors. Sometimes ecosystems never recover.
A. Most people thought that trillium was not getting enough sunlight in the forest.
Explanation – Scientists used to believe that the population of trillium decreased because there were not enough sunlight to reach these plants. Later, it was found that deer used to eat the flowers of trillium plant that led to the decrease of its population.
The seed of the trillium plant is very nutritious and hence consumed by the deer. Because of this, trilliums were found to be unlikely to recolonize local areas on their own.
Answer:
All the above.
Explanation:
Vertebrates are the organisms which have vertebral column or spinal cord in their body. Vertebrates have the following characteristics.
1) The blood circulates through blood vessels from one part to another part of the body.
2) It also consists of a nervous system connected to a brain.
3) Muscles in the organisms allows the organism to move.
Answer: a. action potential frequency is high enough that no relaxation of muscle fibers occurs.
Explanation:
A tetanic contraction occurs due to repeated stimuli at short intervals. In this situation, the muscle fiber does nor relax and contracts again. It is a process of sustained contraction of muscles, which evoke when the motor nerve innervates a skeletal muscle and emits the action potential at high rate. The muscles become hyperactive in this condition.
