Apopulation of hummingbirds is composed of individuals with short or long beaks, which they use to reach nectar inside flowers. a flowering trumpet vine that produces many deep, bell-shaped flowers is introduced to the region, resulting in fewer short-beaked and more long-beaked hummingbirds. which of the following conditions most likely caused this shift in the hummingbird population?
hummingbird predators avoided areas where the trumpet vine grew.
hummingbirds that compete for nectar were more successful with long beaks.
hummingbirds with short beaks overproduced offspring with longer beaks.
hummingbirds starved because the trumpet vine limited the food supply.

Hummingbirds that compete for nectar were more successful with long beaks.

Explanation:  

Adaptation is a change that helps an organism to survive in it's environment. These changes may occur in the genetic make up, physiology, morphology and behavior.

The hummingbirds compete for nectar are of two morphological types such as short and long beaks. Both of these hummingbirds compete for the same resources. Therefore, the hummingbirds with long beaks will be able to obtain nectar from bell shaped flowers. Hence, these will be able to produce more number of offsprings and the adaptation of long beak will become prominent in subsequent generations.

the answer is b. glad to .

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.