Answer:
option A
Explanation:
A stem is one of two main structural axes of a vascular plant, the other being the root. It supports leaves, flowers and fruits, transports fluids between the roots and the shoots in the xylem and phloem, stores nutrients, and produces new living tissue.
but i searched about option d this is the answer i got
Xylem transports and stores water and water-soluble nutrients in vascular plants. Phloem is responsible for transporting sugars, proteins, and other organic molecules in plants. Vascular plants are able to grow higher than other plants due to the rigidity of xylem cells, which support the plant
<u><em>In vascular plants, stems are the organs that hold plants upright so they can get the sunlight and air they need. Stems also bear leaves, flowers, cones, and secondary stem</em></u>
option A is the answer
I wrote the answer in the photo.
Answer:
The answer to the question, would be: during fatigue.
Explanation:
Normally, a muscle fiber will respond to neurological stimulation to perform movement. In this case, the whole process of movement of the fiber results from the biochemical processes that lead the muscle to respond to calcium and use ATP, so that the chain reactions can be carried out, and the fibers can move. However, there is a point at which, ATP is depleted, and there is an overproduction of lactic acid, which prevents muscle fibers from further responding to stimulation from the motor neuron, regardless of the amount of ACh released to bind with the sarcomeres´ receptors. At this point, then, the muscle fibers are incapable of further responding to stimultation, and thus movement is stopped.
Answer AND Explanation:
By examining fossils, biologists have been able to recreate the evolutionary history of the various organisms that have inhabited the earth. From fossil evidence, scientists have found that the first organisms evolved in the sea at about 3.6 billion years ago. These are unicellular organisms that resembled present day bacteria and blue-green algae.