Reservoir . This is the correct answer trust me .
Answer:
The most correct option is the first option
Explanation:
A deer is an herbivorous animal that is usually preyed upon by many wild carnivorous animals like lions, tigers and leopards. Hence, when the population of these wild predatory carnivorous animals reduce, the population of the deer would increase because fewer of them would them would be killed by predators despite them (the deers) reproducing.
Note that a predator is an animal that feeds upon another animal (referred to as prey) of lower "strength".
The question is incomplete. Th ecomplete question is as following:
All of the following protect the skin and mucous membranes from infection EXCEPT
A) multiple layers of cells.
B) tears.
C) saliva.
D) HCl.
E) the "ciliary escalator."
Answer: D) HCl.
Explanation:
- The epidermis, the outer layer of the skin provides waterproofing and serves as a barrier to infection and other laers also sustain any type of injury.
- Tears wash out foreign bodies which enter the eye. In addition, tears contain a substance called lysozyme which has an antibacterial function and works to prevent microbial invasion and infection.
- Saliva protects against infection, especially via the innate immune system. This mechanism is an important first-line protection against bacterial and viral infection
- The mucociliar escalator is within the conducting airways and is composed of mucus and cilia that transfer the mucus up and out of the lungs where it can be removed by coughing or swallowing,
Whereas HCL helps in the digestion process.
Hence, the correct option is D.
I think because humans have sweat glands in their skin that help cool the body by evaporation. Dogs don't have sweat glands but they have extensive blood vessels in their tongues that allow for heat to transfer. Panting helps move air across the tongue which carries away heat from the dog's blood.
Answer:
b. region of DNA consisting of the promoter, the operator, and coding sequences for structural proteins.
Explanation:
Operon is a segment of DNA that carry groups of genes coding for related proteins. An operon consists of an promoter, operator and coding sequences for structural proteins (regulatory and structural genes).
The promoter is the region in operon where RNA polymerase binds and initiates the process of transcription.
Regulatory DNA sequences are binding sites for regulatory proteins that control the expression of the operon "up" or "down." and structural genes code for proteins needed for cell function such as lactose metabolism.
Regulatory proteins acts as a repressor and when bind to operator, blocks the forward movement of RNA polymerase on the DNA.
Hence, the correct option is b.