Answer:
There are several factors that affects the population of a species in an area such as environmental conditions, number of predators and availability of food.
When first species of arrives in the city, city has adequate food and no predators, then the population of birds has increased for few years before arrival of the second flock of birds.n But after the arrival of second flock of birds after many years (might be 10 to 20 years) the population of first species of birds will decrease because now competition for food has increased and both the species will compete for same food present in the city. Extra birds arrival in the city will increase the competition among both species birds for food and the fittest bird will be able to survive.
Hence, the population size of birds (first flock) will decrease in the 10 to 20 years after the extra birds arrive.
The correct answer is option D- surgery to remove the obstruction
Vasectomy is a surgery which is used to permanently sterile a male but in this case vasectomy will be done to remove the scar tissues from the vas deferens and then joined back.
A surgeon will make a small incision on the scrotum and then remove the scar tissues. Once the tissues are removed, the both ends of the tube will be aligned back and sewn together under a microscope.
Answer:
d
Explanation:
Neurons and nerve impulses
I'm not positive but I believe the answer would be D
Answer:
, tree rings usually grow wider in warm, wet years and they are thinner in years when it is cold and dry.
Explanation: