Answer:
A phospholipid
a. has both polar and nonpolar regions.
Explanation:
Phospholipids, as amphipathic molecules, consist of a glycerol molecule, two fatty acids, and a phosphate group that is modified by an alcohol. The phosphate group is the negatively-charged hydrophilic (water-loving) polar head, which face outward and are attracted to the intracellular and extracellular fluid. The fatty acids are the uncharged, hydrophobic (water-fearing) nonpolar tails, which face the inside, away from the water and meet in the inner region of the membrane.
The <span>principal ways in which a load may be applied to a specimen are:
1. Tension
2. Compression
3. Shear
</span>
The force
that pulls material apart is tension and the one that squashes
material together is compression and shear is the action of the force in
trying to cut through the material.
<span> </span>
<span>
</span>
Dhhhhhhhhhhhhhhhhh hddddddddddddddddddda dfffff
Scientists recently discovered that there is this specific gene called "Pitx1" that is responsible for the less of pelvic spines in animals 15,000 years ago. Among the most common example of the animals affected by this gene is are the freshwater skittlebacks.
I hope my answer has come to your help. Thank you for posting your question here in Brainly. We hope to answer more of your questions and inquiries soon. Have a nice day ahead!
Answer:
Yes...This is an example of speciation by natural selection
Explanation:
As we know that natural selection always promote those evolutionary changes that are necessary. Changes that happen in chromosome number always promote with a specie that is closely related to the parent specie and produce fertile off-springs. These new generations are most adaptable and can survive in the environment more efficiently than the previous ones.
Additionally, other than natural selection, speciation can also happen as a result of random mutations, genetic drift and by means of artificial selection as well. But the natural likelihood of all these is probably low as compared to that of natural selection.
