<span>Any physical or psychological event that produces stress</span>
Bulk flow refers to the movement of phloem sap from a source to a sink in plants.
<h3>What is Phloem?</h3>
This is a vascular tissue found in plants which helps to transport and distribution of the organic nutrients derived from photosynthesis.
Bulk flow occur when these nutrients present in the phloem sap are moved from source to sink.
Read more about Phloem here brainly.com/question/983997
So its just easy now to match the layer labelled in the given sample with the standard that I attached.
Therefore B would be the
White Blood cells and these are responsible for the defense of the body from the invasion of foreign objects. Thus
Option 4
Specialized cells are formed when cells differentiate - this is true. When you have stem cells, you're talking about undiferentiated cells with no specific roles in the body. When these cells start differentiating and assuming different roles, they are also becoming specialized.