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daser333 [38]
3 years ago
11

Which statement is true about Earth′s layers?

Biology
2 answers:
Arada [10]3 years ago
8 0

Answer: A.

Explanation:

blondinia [14]3 years ago
3 0

Answer: The Answer Would Be <u>A.</u>

The crust is the least dense layer.

Explanation:

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What are the areas around the world called that contain a extraordinary amount of biodiversity,
Andrei [34K]

。☆✼★ ━━━━━━━━━━━━━━  ☾

These areas are called 'biodiversity hotspots'

(Note : biodiversity means a large range of different organisms/species)

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4 0
3 years ago
A strong covalent bond between adjacent nucleotides is: a) a van der Waals bond. b) an ionic bond. c) a phosphate bond. d) a hyd
zhuklara [117]

Answer:

The correct answer will be option-E

Explanation:

The structure of DNA revealed by Watson and Crick showed that Two strands of DNA are present in the intertwined state forming helix representing DNA as a double helix.

Each strand of DNA is made up of the monomer unit of DNA called nucleotide where each nucleotide binds to another nucleotide through weak covalent bond called phosphodiester bond.

The phosphodiester bond is formed between the 3’-OH group of one nucleotide to 5’ phosphate group of another nucleotide. In this way, the phosphate-sugar molecule forms the backbone of the DNA molecule.

Thus, option-E is the correct answer

8 0
4 years ago
What are different jobs dieticians do?
allsm [11]
Generally speaking, dietitian jobsinvolve counseling people about diet, food, and nutrition and developing eating plans that are tailored to manage disease and promote long-term health and well-being
7 0
4 years ago
Natural selection vs artificial​
Anna35 [415]

Answer:

Please read the explenation for I must go into detail to explain this.

Explanation:

So before I answer your question, I am going to explain what the two things are.

Natural selection:

Natural selection is the evolution of traits in a species due to changes in genetics that is mainly caused by enviormental problems and changes.

If this is a bit confusing, here is an example:

Lets say that a Mandarin beatroot lizard is being killed off by the Mandarin carrot bird because all the trees in the area have turned yellow. 100 years from the time this happened, the Mandarin beatroot lizard that's population was 85% red and 15% yellow is now 90% yellow and only 10% red.

This is because of natural selection. THe Mandarin carrot bird was killing a large portion of the red population. The yellow population was killed only occasionaly. When the Madarin beatroot lizard went to breed, there were more yellow lizards breeding than  red lizards. If you know how genetics work, then you know that in simple terms, this means more lizards will be yellow in the next genetration.

Slowl;y as the generations passed, more and more yellow lizards were bred and born. 100 years later, over generations and generations, the population was almost coimpeltly yellow.

Artifical selection:

Artifical selection is where the human race selects a species and bred specific organisms of that species so that the specific trait being bred for is more evident in the species.

Again, if this is confusing, here is an example:

The lab NV-110 was taking bearlybubble wolves with shorter noses and breeding them together. After 30 years, and many generations, the bearlybubble wolves had noses that were half a inch shorter than the orginal bearlybubble wolves. When the new wolves were let into the forest they had been taken from, half of the died in the first week due to starvation.

The humans took specific traits in a species and bred them together, this process was repeated over 30 years. The specific trait of the new generation of orgniasms has been changed, but this change affected the orgnaisms survive, and was dentrimental to the species.  

So now knowing the two things, what do you think the difference is? Think about ti for a minute before reading more.

The difference betweent the two types of selection is:

  1. Artifical selection can harm or possibly nuetral for the organism, wheareas natural selection will be helpful or nuteral to the organism.
  2. Artifical selection involves humans, wheareas naturals election does not,
  3. Artifical selection does not need any specific change in the enviorment or world to happen, wheareas natural selection does.
  4. Artifical selection is usally quicker than natural selction for artificial selection is purposful breeding, whereas natural selection is by-chance breeding.

I hope this make sense to you, I can try to make this simpler or more detailed if you want me to. ;)

4 0
3 years ago
What important characteristics unique to land plants are thought to be critical evolutionary advances that contributed to their
Nikolay [14]

Answer:c

Explanation the answer is c

5 0
4 years ago
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