Answer:
Protection from infection known as species resistance is a result of both the absence of necessary receptors and lack of suitable environment in the body.
Answer:
I'm glad you asked!
Explanation:
Since there is no common ancestor ,that makes the structures analogous or structures that evolved independently in two living organisms to serve the same purpose.
Answer:
RNA world hypothesis.
Explanation:
RNA is present as the genetic material in some viruses only. RNA is produced from the template DNA by the process of transcription and helps in the protein gene expression.
According to RNA world hypothesis, RNA is considered to be the first genetic material as it has the ability to store the genetic material. The oxyribose sugar makes the RNA more reactive than the DNA molecule. The RNA also has the ability to work enzyme known as ribozyme. Hence, RNA has the ability to store the information and acts as catalyst.
Thus, the answer is RNA world hypothesis.
Answer:
Habituation.
Explanation:
Learning may be defined as the process of change in the behavior of the organism by the result of its experience. Two main types of learning are innate learning and acquired learning.
Habituation may be defined as a type of the non associative learning in which the innate stimulus may get decrease after its repetition. The response of the new born can against the visual memory can be created by taking some picture as stimulus and repeat this stimulus again and again.
Thus, the answer is habituation.
Answer:
Non-polar, lipid-soluble, and small molecule.
Explanation:
A non-polar, small uncharged molecule, for example, CO2, & O2 are the lipid-soluble molecule and can diffuse directly through the phospholipids of the plasma membrane.
The plasma membrane plays an important role in the life process of the organism, and the cells function. It is known as selectively permeable in nature. Non-polar, lipid-soluble, and small molecules can pass through the layer, but large polar molecules and ions cannot pass through it.
