With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.
<h3>
Why is choosing a direction necessary? </h3>
It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can.
When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.
To know more about direction selection for longer necked giraffes visit:
brainly.com/question/3738222
#SPJ4
The thicker and darker the glass, the less light that is transmitted.
The answer is going to be B) lipids. Here’s how I would approach this question. I would eliminate answer choice A because carbohydrates gives animals energy. Then I’d eliminate answer choice C, because proteins are the building block(s) of the body. I’d lastly eliminate D and E because water is macromolecules (at least I don’t think water is) but nucleic acids store genetic information. Lipids are literally fat and what keeps us warm during the cold (sometimes)? Body fat! It’s not always a bad thing. Also you can think of a polar bear, they have so much body fat and that helps keep them insulated & warm.
Ummmm I think the answer is A (sorry if I was not helpful)
Producing a contraction that changes both the length and the shape of the cell