White Blood Cells (WBC), produced by the stem cells found in the bone marrow, manufacture antibodies used to counter the effects of the antigens.
The White Blood Cells are known to provide immunity to the body against foreign bodies like bacteria, virus, proteins, etc. The lymphocyte cells, namely, the B-cells and T-cells are the two key cells that make antibodies for various antigens and kill or lyse the foreign body by recognising the antibiotic marker attach to them.
Answer:
Option D, The DDT killed susceptible flies. The few that were already naturally resistant survived and passed this resistance on to their offspring.
Explanation:
When DDT was sprayed for the first time, some of the house flies which were not capable enough to withstand the adverse effects of DDT , eventually died. And the butterflies that survived through this, were having a natural resistance against DDT. Now, with time these DDT resistant houseflies mated and produced offspring that had genetic trait of resisting DDT by birth. This is the reason, why houseflies after ten years were as abundant as ten years back when the control program was started.
Option D is correct
Answer:
Biodiversity
Explanation:
In the given question, many species of plant species used to grow in the empty lot. The plant species could have provided a home to many animal species. This lot thus formed a small level of the biological ecosystem which is composed of biodiversity.
This lot was changed to a park by the city council which then changed the ecosystem of the area and the main factor that was affected by this change is Biodiversity.
Thus, Biodiversity is correct.
Layers have shifted from one cliff to the next because all cliffs are formed, in one way or another, by the movement of tectonic plates.
<h3>What is a cliff?</h3>
An escarpment, in geomorphology, is a landform that is a transition area between different physiogeographic provinces that involves an acute elevation (greater than 49º), characterized by the formation of a cliff or a steep slope. The term comes from the Italian scarpa.
Whit this information, we can conclude that layers have shifted from one cliff to the next because all cliffs are formed, in one way or another, by the movement of tectonic plates.
Learn more about cliffs in brainly.com/question/25700580
