Answer: Option A
Explanation:
Birds attach the bur of the plant which helps in the pollination. The birds sit on the plant and the burs of the plant gets attached in the legs of the birds which is transferred from one place to another.
Seeds at a different place will help in reproduction and growth of the plants. In this case the birds are carrier of the burs.
This is how the birds help in the reproduction of the plants by becoming the messenger.
Answer:
D
Explanation:
obviously being a biologist a person would choose to research and perform tasks related to bios I.e something which is living
From the smallest single celled organism to the tallest tree all life depend on the properties and reactions of four marcro molecules which are carbohydrate, protein, lipids and nucleic acid.
This is because, these organic molecules are the building blocks of all living things and they are responsible for most of the structure and functions in the body.
Answer:
Pollution.
Explanation:
Pollution is the extinction factors that cause the least extinctions because it has less effect on the population of that organisms. Due to pollution, some organisms die and decrease occur in the population while the rest move to another safe place and some lives in that environment produce resistance against that pollution and are able to live in that pollution so pollution is the factor that cause the least extinction.
