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VashaNatasha [74]
3 years ago
12

The Virginia Opossum has gradually spread from the east coast of the United States to the West Coast as well as the northward in

to Canada. Researchers suggested this move north is in response to the milled are winters and man-made water reservoirs. This is an example of a
A) result. B) theory C) procedure D) hypothesis
Biology
2 answers:
sveta [45]3 years ago
4 0

This is a theory! It cannot be a hypothesis because nothing is being tested, and there are no results or procedures

Jlenok [28]3 years ago
4 0
The answer is theory
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Answer:

sieve-tube elements, companion cells

Explanation:

Sieve-tube elements and companion cells are responsible for the movement of photosynthes through a plant.

The sieve tube elements are shorter (almost organelle-free) living cells, placed end to end, forming the sieve tubes. Their transverse cell walls are called sieve plaques that make connections between cells and through openings called sieves establish the connection between the cytoplasm of adjacent cells.  Each sieve is coated with calose (glucose polymer), which in winter can completely clog the vessel and then dissolve in spring. When infections occur or the vessel is parasitized, it can also be clogged with callose.

Companion cells are specialized parenchymal cells, which contain all the components that exist in living cells, including the nucleus, are the cells most closely linked to the sieved tube element. The Screened Tube Element and its companion cells are related in development, are derived from the same mother cell, and have several cytoplasmic connections to each other. Due to the many connections, the potential function of the companion cells is to release substances into the sieved tube element and, when the nucleus is absent, to include information molecules, proteins and ATP. When a screened element dies, its companion cells also die, which is a demonstration of this interdependence.

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3 years ago
WILL MARK BRAINLYEST.
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Is the answer three

Because they help the body absorb vitamins a, d, e, and k.

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Reactions between atoms occur when:
VikaD [51]

Answer; All the above

A) an atom seeks to fill its outer shell of electrons

B) an atom seeks to balance its positive and negative charges

C) the reaction will result in paired electrons

Explanation;

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-During a chemical reaction an atom may lose of gain electrons resulting positive and negative ions (ionic bond formation) or may result to the paired electrons (sharing of electrons).

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A. Cells display contact inhibition
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storchak [24]

Answer:

e. PhoU keeps PhoR bound to the phosphate transporter protein Pst

Explanation:

PhoU is a membrane protein known to regulate the transport of phosphate (Pi) between cellular compartments. It has been discovered that mutations in this protein cause lethality because the cell becomes incapable of controlling the intracellular levels of  Pi, this being toxic for the cell. PhoR is a histidine kinase/phosphatase. When the Pi level is considered to be a limiting factor, PhoR autophosphorylates at a histidine residue and then donates its phosphoryl group to PhoB. On the other hand, when the Pi level is high, this protein removes the phosphoryl group from phospho-PhoB. Finally, the Pst is a signal transduction protein that acts as a transporter capable of switching its conformation during the transport of PI.

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