The type of thermal energy which flows from one substance to another when the temperature of the two substances is different is known as heat. Hence, the blank can be filled with 'heat'.
By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments. Fossils can tell us a lot about the past.
The respiratory membrane is made of two layer that comes from alveoli and the blood vessel. Oxygen and carbon dioxide will diffuse between the layer. The rate of diffusion can be influenced by the gradient of the gas concentration, the surface area of the reaction and the distance between the vessel and alveolus.
The thin membrane will reduce the distance of the diffusion, thus increasing the diffusion rate.
A thicker membrane will impede the speed of the diffusion, makes the respiratory organ function decline. This can be observed when the lung inflammed(by infection, cancer or other cause), makes the fluid from blood vessel enter the interstitial space.
Answer:
Option (A).
Explanation:
Epigenetics may be defined as the study of the heritable phenotype changes that do not change the sequence of DNA. The gene activity or gene expression changes in epigenetics. Environment may also brings the changes in gene expression.
The change in phenotype of the individual must be inherited in epigenetic changes. The chromatin must be modified but the nucleotide sequence remains unaltered in epigenetic changes.
Thus, the correct answer is option (A).
Bacteria reproduce<span> by binary fission. In this </span>process<span> the bacterium, which is a single cell, divides into two identical daughter cells. Binary fission begins when the DNA of the bacterium divides into two (replicates).</span>
