It is intended to increase immunity against that antigen back to protective levels, after memory against that antigen has declined through time.
Answer:
The experimental results cannot be reproduced.
Explanation:
The ability to follow a specific set of procedures and achieve the same results is one of the key parts of the scientific method. If the results cannot be replicated, the study is invalid. Unfortunately, results of invalid studies are sometimes announced to the public before replication attempts can be made to invalidate the study. Trying to reverse public belief at that point can be impossible.
SEM and TEM are electron microscopes whereas the SEM uses reflected electrons and TEM uses transmitted electrons to form an image
Explanation:
- SEM is the scanning electron microscopes and TEM is the Transmission electron microscope
- SEM works by detecting the scattered electrons to create an image of the sample whereas the TEM detects the transmitted electrons to create the image of the sample
- SEM will only be analysing the surface of the sample whereas TEM collects data vertically also
- TEM sample needs to cut thinner than SEM and TEM will give high-resolution images than SEM
Answer:
Contamination from other sources.
Explanation:
A reduction in sea ice due to climate change has negatively affected the food abundance of Penguins.
Explanation:
- Sea ice is ocean water frozen blocks. Unfortunately, rather than most other areas, climate change impacts Antarctica.
- If the temperatures on the surface of air and water rise, the sea ice melts. This leads to many marine mammals and seabirds losing their habitat and food supply, including Adelie penguins.
- The biggest threat to the penguins stems from changes in the Antarctic sea-ice cover, that will affect its feeding and breeding.
