Answer:
Graph A
Explanation:
With harder seeds, birds will need larger beaks in order to crack the seeds. The birds with smaller beaks won't be able to crack the seeds and will die because they can't eat anything. Graph A is the only one that shows a distinct increase in bird beak size.
Biologists use plasmids to join two DNA molecules together.
When an antigen is bound to a class i mhc molecule, it can stimulate a cytotoxic T cell
A transmembrane chain, which is produced by a class I MHC gene, plus a tiny extracellular protein known as 2-microglobulin make up class I MHC proteins. The gene that encodes the 2-microglobulin does not belong to the MHC gene cluster, and it does not traverse the membrane.
The cytotoxic T cell interacts with a virally infected cell via its T cell receptor and the MHC class one protein on the virally infected cell, which is the interaction between the MHC class one protein and the cytotoxic T cell. The identification of targets for destruction by a cytotoxic T cell depends on this interaction between the T cell receptor and MHC class one.
Learn more about cytotoxic T cell here;
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Well for one thing water wouldn't collect in drops. It also would affect pretty much everything that lives in or on water. For example there are kinds of bugs that use the surface of the water to stand on and lots of other organisms that use surface tension for their own benefits. Hope this helps!