Answer:
A constant allele frequency is maintained by populations in absence of natural selection as both the alleles for the trait impart equal survival advantage (adaptive) to the individuals under the prevailing conditions.
Explanation:
A population maintains constant allele frequencies in absence of evolutionary forces such as natural selection. This occurs when the existing allele frequencies of a gene are adaptive to the individuals. Both the alleles for a trait should be equally beneficial in terms of survival and reproductive success of the individuals under the given conditions. Therefore, both the alleles are maintained with existing frequencies.
Answer:
Some may cause diseases.
Explanation:
Eubacteria and Archaebacteria differ by a few characteristics:
- DNA replication
- Transcription
- Type of translation machinery
- Cell wall structure
It has been found that these do reproduce quickly and sometimes in humans. It may cause some danger in some situations as cholera and vibrio are virulent and dangerous diseases to humans.
In other aspects it does not pose a threat to human health in the case of <em>Lactobacillus. </em>
Archaebacteria on the other hand is not known use humans as a host but they may infect other Eubacteria and cause them to be negatively affected.
Fast reproduction/division rate means that the infection of the bacteria cannot be slowed down or stopped before the organism it has taken over becomes affected.
Answer: E) tight junctions
Explanation:
Tight joints act as barriers that regulate the circulation of water and solutes between the epithelial layers. Tight junctions are classified as a paracellular barrier, which is defined as having no directional discrimination, but movement is largely dependent on solute size and load.
Answer:
Wind pipe ( Where you breathe)
Explanation:
Answer:
Conservation efforts have had a positive impact on ecosystems that have been previously harmed due to human activity. Conservation efforts have helped preserve and even restore habitats that had been damaged or threatened by human activity. They have also helped protect endangered species.