Answer:
The basic unit of life is a cell
Answer:
Species separated by a physical barrier for a long time, suffer allopatric speciation, so they can not interbreed anymore.
Explanation:
Allopatric speciation consists of the geographic separation of a continuous genetic background giving place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flow, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
Vicariance is the geographical separation of an original population into two or more new groups. Discontinuities in the physical environment like rivers, mountains, water, etc., are physical barriers that impede genetic flow between the separated groups.
The process of allopatric speciation involves different steps:
- The emergence of the barrier.
- Interruption in the genetic interchange
- The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation.
- Genetic divergence by natural selection and reproductive isolation makes it impossible for the two groups to mate even if the barrier disappears.
- Prezigotic isolation mechanisms favored by selection once occurs a secondary contact between the new species in formation.
A good index fossil is one with four characteristics: it is distinctive, widespread, abundant, and limited in geologic time. Because most fossil-bearing rocks formed in the ocean, the major index fossils are marine organisms
Regional anatomy might focus on studying all of the structures of the ankle and foot.
<h3>What is Regional Anatomy?</h3>
- The shapes, locations, and relationships of the human body's structures in a particular region are the subject of regional anatomy.
- One of the fundamental building blocks of safe and effective medical practice is a thorough understanding of regional anatomy.
- After finishing this course successfully, students should receive knowledge of the major anatomical divisions, such as those of the thorax or upper limb, with an emphasis on the interactions between the numerous systemic structures (such as the muscles, nerves, and arteries) found there.
- Understanding the morphological function of the various body regions in relation to one another and the body as a whole.
- The capacity to employ regional anatomical knowledge to comprehend the underlying anatomical causes of actual biological issues.
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The answer is A. small nutrients
