Disruptive selection is taking place in the snail population based on their shell color. Snails with light colored shells blend in with sand while snails with dark colored shells blend in with rocks. This leads to a split in the population with extreme phenotypes being favored.
The type of natural selection taking place in this snail population is disruptive selection. Disruptive selection occurs when extreme phenotypes are favored over intermediate phenotypes, leading to a split in the population. In this case, snails with light colored shells are favored in the sandy habitat, while snails with dark colored shells are favored in the rocky habitat. This results in a bimodal distribution of shell color.
#SPJ2
a) liters
b) grams
c) pounds
d) meters
Answer:
it should be Kg but i see you dont have that answer on there.
Explanation:
Answer:
grams
Explanation:
The ester bonds in lipids are found where the fatty acids of the lipid join to the glycerol back bone of the lipid.
Lipids are made from two kind of molecules namely Glycerol and Fatty acids. A glycerol molecule is made up of three carbon atoms with an alcohol group attached to each of the carbon atoms and hydrogen atoms occupying the remaining positions.
A fatty acids consist of an acid group at the end of the molecule and a hydrocarbon chain.
In a process called esterification, the acid group of the fatty acid joins to the alcohol group of the glycerol molecule and water is released resulting in the formation of a linkage called an ester bond.
(A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.
(B) All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings.
(C) Winged dinosaurs that flapped their wings in flight would have been able to fly more effectively than winged dinosaurs that could only glide.
(D) If Sandactylus flew by flapping its wings, then paleontologists would certainly be able to find some evidence that it did so.
(E) Heat generated by Sandactylus in flapping its wings in flight could not have been dispersed by anything other than the blood vessels in its wings.
Answer:
(A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.
Explanation:
The given passage compares presence of similar structures, the blood vessels, in the wings of bats and winged dinosaur Sandactylus to explain the unknown function of wings in the dinosaur species. Bats are flying mammals and use wings to fly. The blood vessels in their wings serve to spread out the heat that is produced by flapping of wings during flying.
The presence of blood vessels in wings of dinosaur Sandactylus suggests that they also used wings for flying. If Sandactylus species did not use the wings for flying, their wings should not have blood vessels as gliding movement does not require it.
Answer:
The correct answer would be plasma membrane or cell membrane.
Plasma membrane is phospholipid bilayer structure which separates the intra-cellular components from extra-cellular environment.
One of the most important characteristics of the plasma membrane is that it is selectively permeable in nature.
It allows some substances to move freely in and out of the cell while restricts the movement of other substances. It is similar to function of security guard who decides whom may enter and whom may not.
Small molecules and uncharged particles can travel across the plasma membrane easily by simple diffusion. For example, exchange or diffusion of gases (carbon dioxide and oxygen) across the cell. The movement of such substance depends upon its concentration gradient across the membrane.
Charged particles and large sized substances require protein channels to travel across the cell. Such substances are transported either with the help of facilitated diffusion or active transport.