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Veseljchak [2.6K]
3 years ago
6

Which element is considered the most versatile element in living organisms and why?

Biology
1 answer:
Dafna11 [192]3 years ago
5 0

Answer:

Carbon

Explanation:

Carbon, because it can bond with many elements to form complex molecules" is the element that is considered the most versatile element in living organisms

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What is intramembranous ossification? a. the formation of bone from preexisting hyaline cartilage models b. the formation of bon
Stolb23 [73]

Answer:

c. the formation of bone from within fibrous membranes

Explanation:

On the basis of formation ossification process is divided into two types:

1) Endochondral ossification : The process by which bone is formed from haline cartilage.

2) Intramembranous ossification : The process by which bone is formed by replacing a fibrous membrane and not from cartilage. This type of ossification occurs as follows :

  • An ossification center appears in the fibrous connective tissue membrane.
  • Bone matrix is secreted within fibrous membrane
  • Woven bone and periosteum forms.
  • Bone collar of compact bone forms and red marrow appears.

Hence option c. the formation of bone from within fibrous membranes is the right option

5 0
3 years ago
Which of the following are characteristics of fungi?
navik [9.2K]
Parasitism and autotrophism
5 0
3 years ago
How do you know if something is living or not?
Murljashka [212]

Answer:

You can determine something is living by classifying it if it has the seven characteristic of life

7 0
2 years ago
Consider a species of sparrow that originally lived only in Alaska but recently expanded its range through North America, then C
Shtirlitz [24]

Answer:

North America is the one with the highest heterozygosity frequency for most loci, followed by Central America, and finally, South America with the lowest heterozygosity level.  

Explanation:

Some different forces or mechanisms might alter H-W equilibrium and lead to evolution, such as mutation, natural selection, migration, and genetic drift.

In the exposed example, we have a species of sparrow that migrates from Alaska to North America. Migration is unidirectional, which means that the movement occurs in only one direction: from Alaska to North America. We should also consider that the first immigrants colonized the area for the first time, meaning that there was not a receiving population of the same species already established. Finally, we need to consider that Alaska´s environmental conditions are very different from North America´s environmental conditions.

When a species arrives at a new place, it needs to adapt. The establishment and dispersion of the species in the new area depend on previous adaptation. So, when the firsts sparrow individuals arrived in North America, they faced new environmental conditions that acted as selective pressures that drove to the occurrence of mutations. A mutation implicates a stable and inheritable change in the genetic material. A mutation introduces changes, new alleles in the population, variability. But mutation rates are very low and have no evolutive direction, so they need another force to increase or decrease the mutant allelic frequencies. Natural selection benefits new advantageous alleles and transmits them to new generations changing their relative frequencies. <em>So, sparrows arrive in North America, mutated, and natural selection favored the beneficial mutations leading to a better adaptation to the environment.</em> This means that the heterozygosity level in this new recent population is very high.

As animals adapt to the new habitat and have better dispersal genes, they get to disperse even more. So they start new migration south, to Central America and South America. Again, they are moving to new regions with new conditions, and to establish they need to suffer new adaptations. But remember that we are talking about a recent event in time. Probably the animals migrating south are just a few.  They have not spent enough time yet in the new area, to adapt to the new environment and to include new genes into their population. What is even more, as they are a small new population moving south, they are more vulnerable to genetic drift events. Genetic drift acts on a population decreasing the variability between individuals, hence, decreasing the heterozygosity. <em>This small population suffers low mutation, has not enough time to establish, and is more vulnerable to genetic drift events.</em> The heterozygosity level is probably inferior to North America´s one.

Comparing the three areas, we could say that North America is the one with the highest heterozygosity frequency, followed by Central America, and finally, South America with the lowest level of heterozygosity.

8 0
2 years ago
On which side of the mountain would you be most likely to find a forest?
soldi70 [24.7K]

Answer:

Mountain lands provide a scattered but diverse array of habitats in which a large range of plants and animals can be found. At higher altitudes harsh environmental conditions generally prevail, and a treeless alpine vegetation, upon which the present account is focused, is supported. Lower slopes commonly are covered by montane forests. At even lower levels mountain lands grade into other types of landform and vegetation—e.g., tropical or temperate forest, savanna, scrubland, desert, or tundra.

The largest and highest area of mountain lands occurs in the Himalaya-Tibet region; the longest nearly continuous mountain range is that along the west coast of the Americas from Alaska in the north to Chile in the south. Other particularly significant areas of mountain lands include those in Europe (Alps, Pyrenees), Asia (Caucasus, Urals), New Guinea, New Zealand, and East Africa. The worldwide distribution of mountain lands is shown in Figure 1.

Figure 1: Worldwide distribution of mountain lands.

Explanation:

8 0
2 years ago
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