The excretory system is responsible for removing all of the following from the body excep t
A. Toxic Waste B. Gaseous Waste C. Dissolved molecules D. Cells
Answer:
D. Cells
Explanation:
The excretory system consists of organs that help the body to get rid of excess and waste materials from the body, and also helps in maintaining internal homeostasis in the body. These organs include the large intestine, skin, lungs, kidneys. Most of the wastes are products of metabolism. These waste materials that are no longer useful to the body could be in liquid or gaseous form. Examples of substances removed from the body by the excretory system are urine, feces, sweat etc.
Cells are not part of the substances removed by the excretory system.
(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.
The given statement-Logistic growth curves are density-dependent is True.
Logistic growth curves describe population growth that takes into account density-dependent factors, such as competition for resources and predation.
The logistic growth model assumes that as a population grows, it will eventually reach a point where resources become limited, and the growth rate slows down.
This is known as the carrying capacity of the environment, which is the maximum population size that can be supported by the available resources. Thus, the growth rate of the population becomes dependent on the population size or density. Hence, the statement is True.
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The correct answer is true.
The density dependent factors are those factors, which is affect the size of the population.
The logistic growth curve shows a a lag phase, a log phase and a stationary phase. In the lag phase, the growth of the organism is minimal, here it prepare for the growth, in log phase, the population growth is exponential. As the resources in a particular area is limited and carrying capacity is also limited, after a certain population density, the growth become stationary, which means mortality becomes equal to the birth rate. As the logistic curve is affected by the density of the population, it would be density dependent.
P.S.- if the resources are not limited, the population continuous to grow exponentially, and would represent exponential growth curve.
Answer:
C nucleic acids
Explanation:
c. Selective Breeding
d. Evolution
Answer:
A
Explanation:
Sry if incorrect
Answer:
the molecule that bears genes, is passed from parents to children, and provides instructions for the growth and functioning of living organisms