Answer: The drug abuse is influenced by the environment and exerts influence on the gene expressions.
Explanation:
The genetic make up of the person is decides, which genes will be expressed and develop a trait in an individual. But this genetic expression can be influenced by the environmental factors like food, exposure to sunlight, and others. This study which relate environment with the genetic make up is called epigenetics. No person is drug addict by birth but the consumption of drug can influence the genetic make up and traits in a abuser. So here, the environment is influencing the genetic basis of a abuser.
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Answer: Pulmonary veins
The pulmonary veins bring oxygen-rich blood to the left atrium.
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B) are heterotrophs.
C) consume organisms located above them.
D) are heterotrophic, primary consumers.
The base of the pyramid is built from organisms that are primarily autotrophs, which is option A, as autotrophs are organisms that produce their own food using energy from the sun or from inorganic substances, such as certain types of bacteria that use chemosynthesis.
The base of the pyramid in an ecological pyramid is built from organisms that are primarily autotrophs. Autotrophs are organisms that are capable of producing their own food using energy from the sun or from inorganic compounds. They are also known as primary producers, and they form the base of the food chain in most ecosystems. Examples of autotrophs include plants, algae, and some bacteria. As the base of the pyramid, autotrophs support all other organisms in the ecosystem as they provide the energy and nutrients necessary for their survival.
Hence, the base of the pyramid is built from organisms that are primarily autotrophs, which is option A, as autotrophs are organisms that produce their own food using energy from the sun or from inorganic substances, such as certain types of bacteria that use chemosynthesis.
Learn more about the autotrophs here.
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Answer:
have two alleles for the gene
Explanation:
B. recognize infected body cells.
C. discover antigens in body fluids.
D. are made in the red bone marrow.
The correct answer is (c) discover antigens in body fluids.
B lymphocytes act as antigen presenting cells that recognizes and displays the antigen to the white blood cells. These cells process the antigens that are present in body fluids. Professional antigen presenting cells includes B-lymphocytes, macrophages, dendritic cells, etc.