Answer:
There is no graph for me to refer to...
Explanation:
Yes. because they study the facts on how pesticides and other farming products can affect animals and their enviroment.
Answer:
b). activation of T cells
Explanation:
An APC (antigen-presenting cell) can be described as an immune cell, which detects, uptakes, and informs the acquired immune response when an infection takes place. B cells, macrophages, and dendritic cells are antigen-presenting cells.
These cells play an important role in activation of T cells. T cells are unable to recognize soluble or free antigens and can only recognize antigens processed and presented by carrier molecules, such as MHC molecules.
Presence of MHCII molecules is a defining feature of APCs that process and present antigens to T cells. Hence, all antigen-presenting cells help in activation of T cells.
Thus, the correct answer is option (b).
<h2>Ecological succession</h2>
Explanation:
An area with bare rock or a disturbed site with no vestige of its former community undergoes secondary succession while an area recovering from forest fire undergoes primary succession.
-False.
Ecological succession that takes place in an area which was formerly inhabited by living organism gots disturbed or barren due to some natural calamity is called secondary succession.
In the given question both the cases reflect that the area which was experiencing succession, was formerly inhabited by living communities. So in both the cases secondary succession is taking place.
Answer: The correct option is B. Vertebrates appeared in the oceans before they moved on to land.
Vertebrate paleontology involves study of fossils of the vertebrates starting from the earliest fishes to the ancestors of modern day mammals. The spreading up of life from water to land needed modifications and adaptations such as protection from drying and support against the gravity. The tetrapod vertebrates evolved and started to live on land from oceans during the Devonian period. The succession of the Devonian period showed fossil evidences towards terrestrialization
.