Answer:
Fossils provide direct evidence of evolution. They show the changes of animals from ancient organisms to present form. Fossils are the preserved remains of earth layers. There are 4 types of fossils-
Original fossils that are not very old. e.g. teeth, skeleton, shells.
Frozen fossils
less permanent fossils
casts, molds, and prints - wings, skin, leaves, etc.
The fossils show the adaptive radiation in horses, humans. The transition fossils form the connecting link between different groups such as fish and amphibians, reptiles and birds, etc.
e.g. Archeopteryx is the connecting link between the reptiles and birds.
The modern horse Equus have several ancestor species, we came to know from the fossil records.
The fossil record shows the evolution of humans and their ancestors.
The seasonal movement of animals from one place to another (usually occurs in species with ability to flight and in large amount
DDT (DiChlorodiphenyltrichloroethane) has popular been used
as a pesticide since the 19th century used especially during World War I to control typhus and malaria
vectors. The chemical had application as
a pesticide both in homesteads and in agriculture. However, it has been banned in the USA due to claims of its carcigonecity and its negative environmental impact. DDT has been shown to harm most arthropods indiscriminately.
Answer:
The correct answer is a. hydrogen bonds between the amino group of one peptide bond and the carboxyl group of another peptide bond.
Explanation:
The secondary structure of proteins are formed by α-helices and β-structures, that can be supported by hydrogen bonds between amine hydrogens and another peptide bond.
