The biological species concept<span> is the most widely accepted</span>species concept<span>. It defines </span>species<span> in terms of interbreeding. For instance, Ernst Mayr defined a </span>species<span> as follows: "</span>species<span> are groups of interbreeding natural populations that are reproductively isolated from other such groups."</span>
Phloem is the tissue in the plant system that transports the nutrition and the food materials to the plant parts. It is composed of many specialized cells like fibres, parenchyma cells, companion cells and sieve tubes.
Phloem's end walls have openings that let water and nutrients pass through them.
<h3>How does the structure of phloem help in transportation?</h3>
- The tissue of the transporting system has small openings at their end sections that allow the passage of the food and water up and down the vessels of the plant.
- The tiny holes present for the exchange of gases and water are called stomata while the root hair changes its shape to absorb water from the soil.
Therefore, option A is correct.
Learn more about the phloem here:
brainly.com/question/3138900
Answer:
Having a battle in my mind. First and last options are out. I attached an image to help you figure it out.
<span>Food chain refers to a process cycle from producer to
consumer to decomposer.
Plants – herbivores – omnivores – carnivores</span>
<span>Start
-> Plants -> herbivore insect -> spiders -> small bird -> Snake
-> hawk -> fox -> lion -> when died the body will be eaten by hyena->
when hyena died -> body get decompose and be eaten by worms and the rest will be plant’s
fertilizer.
The process of the food chain will then again takes place over and over again.
</span>
The Human Body<span> Has Over 600 </span>Skeletal Muscles<span> That Move Bones and Other Structures. </span>Skeletal muscles<span> attach to and move bones by contracting and relaxing </span>in<span> response to voluntary messages from the nervous system. </span>Skeletal muscle<span> tissue is composed of long cells called </span>muscle<span> fibers that have a </span>striated<span> appearance.
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~Dukuccino</span>