Answer: The correct answer is C) Community stability.
Keystone species is an individual species or a group of species of plants and animals, which play a significant role in maintaining the structure of community and the functioning of ecosystem.
This means that when these species are removed from an ecosystem, they will result in the dramatic changes in the structure and functioning of the ecosystem.
Example- In terrestrial habitats, fire ants behaves like a keystone species ( a predator keystone species) that suppresses the number of individuals and species of arthropods, which could have harmful effects in the agriculture.
Answer: A natural disaster occurred that separated squirrels.
Hence, this would be the answer.
Answer:
B. A natural disaster that separated squirrels
Explanation:
I can confirm this is correct because I just did the test.
Answer:
Your three blood cell types have different sizes, shapes, and functions. Yet they all started out alike. Within each cell of your body there are chromosomes which give the instructions for cell processes. These instructions include the differentiation of your blood cells
Explanation:
In the chromosomes the DNA is packed, from its sequence and from other control mechanisms the genetic expression is regulated and instructions are given to generate one or another type of cell. This happens because there is a differential expression of the different genes according to the cell type.
(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.
B. ice core bore
C. weather balloon
D. underwater sonar
TrueFalse