Answer:
sympatric speciation
Explanation:
Different sympatric species have the same closest ancestor and live in the same area but inhabiting different niches.
The steps for sympatric speciation are:
- An ancestral species inhabit a geographic area.
- With time, different populations of the same species occupy different niches or microhabitats in this general area.
- As the microhabitats are different, they have different environmental pressures that are acting on each population.
- These pressures lead to the origin of differences between groups, which need to adapt to each environment
- Each population suffers genetic changes due to environmental conditions. These changes are inheritable.
- With time, these differences drive to the final complete divergence of populations, becoming different species and reproductively isolated.
In sympatric speciation, the interruption of genetic flow must be fast, and there must be differences in niches so no species can compete and displace the other species. <em>Speciation occurs in the same distribution area of the original species</em>. The new species originate in a place with no physical barriers but different environmental pressures.
In the exposed example,
- <em>The introduced Cichlid fishes 200 years ago</em> → Original species and the common ancestor between the new derivated species
- <em>The lake</em> → general geographic area
- <em>The main lake and the streams</em> → Microhabitats or niches with different pressures each
- <em>The groups are splitting into two genetically and physically different types of fishes. They do not mate. There is no genetic flow between groups.</em> → Speciation process.
Explanation:
Uujjuuuhwhich category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?which category of desktop computers, notebooks (laptops) and Personal Digital Assistants (PDA's) fall?
The lymphatic system has many functions in the human body. Here are the two main ones.
1.) the fat tissue in the body is transported through lymph tissue, part of the lymphatic system.
2.)the lymphatic system also has a significant role in the human defense system. After a pathogen (a disease causing substance eg. Bacteria) has bypassed the general defence system, its up to the lymphatic system to fight these infections.
It does this through the production of antibodies against these pathogens. Cells are produced to produce and antibodies, namely, b and t cells. Examples of these cells include; killer t cells(what it says on the tin.) memory b AND t cells memorise the pathogen so it does not infect you again(induced immunity). Suppressor t cells stop killer cells from destroying normal healthy human cells. These particular cells have a significant role immunity.
Not 100% sure but I think the lymphatic system has a role in the production of phagocytes and monocytes which engulf the bacteria(as opposed to using chemicals to destroy them). Ps. Antibodies recognise pathogens through specific antigens on these harmful cells.
Finally, I believe the lymphatic system can be linked with white blood cells in the production of additional immunity proteins but you may have to do your own research on that!
GOOD LUCK
Answer:
B
Explanation:
it ends with Two haploid daugther cells!
