The answer should be nonflowering plants. the definition of nonflowering plants is: A Plant that makes seeds within cones or produces spores instead of seeds.
A.
Tight junctions are <u>cell junctions in areas that are subjected to great mechanical stress, such as the skin and heart muscles</u>
Explanation:
They are also called <u>exclusion junctions</u>. This is because they form very tight junctions between adjacent cells such that only very small molecules, like ions, can pass in between the intercellular spaces of the cells. This is why they are found in regions where very little leakage is needed such as the heart -where blood could leak out during pumping- or the skin where foreign material cannot be allowed into the body.
They are also favorable in high stress regions because they bound cells together giving them structural integrity because they limit the movement of cells and their membrane intergral proteins.
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They need water for their eggs to thrive. Baby frogs are born with gills and ate basiclly like fish for the first weeks of their lives.
Answer:
In plants, dead cells are not excreted, rather, they form key structural elements which support and protect living tissue as the organism grows. Two examples of useful functions are the formation of (1.) xylem vessels and (2.)sclerenchyma.
Explanation:
- Xylem vessel: mature xylem vessel is made up of dead cells called <em>vessel elements</em> aligned end-to-end; here, the ends are dissolved and the protoplasm is absent. These form long, continuous tubes that facilitate the unobstructed flow of water and minerals to other areas within plants.
- Sclerenchyma are comprised of dead cells which have secondary walls reinforced with lignin. In plants, they provide key structural support and greater mechanical strength to prevent damage or tears within the plant tissue.
