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jarptica [38.1K]
3 years ago
10

Explain the difference between a theory and a law?

Biology
2 answers:
babymother [125]3 years ago
6 0

A theory is a group of related hypotheses that can be accepted as true based on repeated investigations with similar results. A law is a scientific concept that explains what patterns of behavior will be seen through repeated investigations.

Black_prince [1.1K]3 years ago
3 0

In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.


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Describe the characteristics and classification of seedless vascular and nonvascular plants
Lady bird [3.3K]

Answer:

Vascular plants, also known as tracheophytes, are plants found on land that have lignified tissues for conducting water and minerals throughout the body of the plant.

1. These lignified tissues are also called vascular tissue and consist of water-conducting xylem tissue and food-conducting phloem tissue.

2. Vascular tissue forms a central column, also called stele, through the plant axis for the transport of different substances.

3. Vascular plants are said to have a true stem, leaves, and roots due to the presence of vascular tissues.

4. The root is a true root that enables the plant to anchor onto the soil and gets nutrients from it.

5. The leaves are broad and have stomata that work for gas exchange and support transpiration.

6. The stem of vascular plants is multilayered with vascular tissue that helps in the protection and conduction of food and water.

7. The arrangement of these issues might be different in a different group of plants as it depends on the pattern of division of cells.

8. The xylem is composed of non-living matter, tracheids, and vesicles, hardened by lignin that provides a stiff structure to the tissue. 9. The phloem, on the other hand, contains living sieve elements that are not lignified.

10. Vascular plants are capable of surviving on land due to their ability to transport food, water, and mineral to different parts of the plant by creating pressure through the tissues.

11. Besides, they also have several modifications that facilitate their survival on land.

12. Another essential characteristic of vascular plants is that the principal generation phase in these plants is the sporophytic phase where they produce diploid spores.

13. Vascular plants are tall and large in size compared to the non-vascular plants because of their ability to transport necessary substances to all parts of the body via vascular tissue.

14. It is believed that vascular plants are a more evolved version of non-vascular plants and thus came later in the evolutionary history.

15. Vascular plants are divided into two groups; non-seed plants or lower vascular plants or cryptograms and seed plants or higher vascular plants or phanerogams.

16. The lower vascular plants include plants like ferns that although are adapted to survive on land still have some characteristics of their aquatic ancestry. These plants belong to the group Pteridophyta.

17. The higher vascular plants are numerous and extremely diverse and are further divided into different subgroups.

18.Some examples of vascular plants include maize, mustard, rose, cycad, ferns, clubmosses, grasses, etc.

6 0
2 years ago
The big bang theory of the formation and expansion of the universe is supported by the observed ___
jeka94

Answer:

Universe

Explanation:

This should go to physics category

The big bang theory is derived from the observed universe, and the microwave background signal that arrived to earth...

3 0
3 years ago
What are the common promoter elements found in eukaryotic genes, and how are they different from enhancer elements?
V125BC [204]

Answer:

In eukaryotic cells you find core and proximal promoters.

Promotors are specific DNA sequences where transcription factors (proteins) and RNA polymerase binds to initiate transcription. Promotors are located upstream the coding sequence

Core promoters are where RNA polymersae binds and proximal promoters are where transcription factors bind.

Enhancer elements are DNA sequences where transcription factors (proteins) bind to increase the rate of expresion of an specific gene. Enhancers can be located either upstream,  downstream or thousands of nucleotids away  from the of the coding region.

Explanation:

Promoters and enhancer are key elements for controling gene regulation. Transcription begins when chromatin rearranges from a condensed state to a accesible state, this allow to transcrition factors and RNA polymerase to  bind specif DNA sequences (promotors).  Proteins bind to enhancers , this complex develops a DNA loop, so that the protein that is bound to the enhancer interacts with the RNA polymersase. When this interaction is made, the activity of the RNA polymerase is increased.

7 0
3 years ago
Are crickets producers, consumers, or decomposers?
____ [38]
Hey there!

Here is your answer:

<u>The proper answer to this question is option B "consumers".</u>

Reason:

<u>Producers are organisms like plants they produce food for other organisms. (Plants) Consumers are organisms that eat other organisms. (Some insects, mammals, etc)  Decomposers are organisms that decompose on raw flesh, or grow on fertilizer. (fungi) </u>

Also...

<u>Crickets would be consumers because they eat plants and plants are organisms therefore the cricket is consuming the plant. </u>

Therefore the answer is B.

If you need anymore help feel free to ask me!

Hope this helps!

~Nonportrit

4 0
3 years ago
Read 2 more answers
What benefit does diffusion provide the cell? A. divides the cytoplasm B. carries out meiosis C. produces protein D. carbon diox
Pie
The answer is letter c. produces protein.
<span>Water, ions and molecules requires for cellular processes, can leave and enter cells through a passive process like diffusion. Diffusion is random movement of molecules yet has a net direction to regions of lower concentration in order to reach a balance. Simple passive diffusion takes place when small molecules pass through the lipid bi-layer of  a cell membrane. Depending on carrier proteins, facilitated diffusion is imbedded to allow certain substances to pass through, which may not be able to diffuse through cell membrane.</span>

7 0
3 years ago
Read 2 more answers
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