Answer:
The correct answer would be a. autotrophs.
Autotrophs, also called producers are the organisms which are able to produce complex organic compounds such as fats, proteins and carbohydrates from simpler substances present in the environment.
They are of two types based on their source of energy:
Photoautotrophs: These are the organisms which use sunlight as the source of energy in order to produce organic compounds.
For example, green plants synthesize their own food (glucose) from carbon dioxide with the help of sunlight and chlorophyll. Oxygen is released as the byproduct. The overall process is termed as photosynthesis (photo meaning photon or light energy).
Chemoautotrophs: They get energy from electron donor compounds such as sulfur, hydrogen sulfide et cetera.
The answer A. autotrophs
Gene expression is a regulated process
Cells cannot express certain genes
Unexpressed genes are never useful
Answer:
(B)-Gene exspression is a regulated process
Explanation:
Its right I just took a test on it.
Approximately 90 to 100 Pg of carbon moves back and forth between the atmosphere and the oceans, and between the atmosphere and the land biosphere. Although these exchange rates are large relative to the total amount of carbon stored in the atmosphere, the concentration of CO 2 was constant
Marine plants and animals play a role in the uptake and release of carbon dioxide in the ocean. Plants, primarily phytoplankton but also macrophytes such as this seaweed, take up carbon dioxide and release oxygen, which oxygen-dependent animals need to survive.
Marine plants and animals play a role in the uptake and release of carbon dioxide in the ocean. Plants, primarily phytoplankton but also macrophytes such as this seaweed, take up carbon dioxide and release oxygen, which oxygen-dependent animals need to survive.
at 280 parts per million (ppm) by volume for at least 1,000 years prior to the industrial era. Atmospheric concentrations of CO 2 were constant because the carbon being removed from the atmosphere in some places exactly matched the CO 2 being added to the atmosphere in other places.
Today, CO 2 concentrations in the atmosphere are increasing as a direct result of human activities such as deforestation and the burning of fossil fuels (e.g., coal and oil). Over the past 150 years, CO 2 concentrations in the atmosphere have increased by as much as 30 percent (from 280 to 370 ppm).
All trees, nearly all plants from cold climates, and most agricultural crops respond to increasing atmospheric CO 2 levels by increasing the amount of CO 2 they take up for photosynthesis . It is believed that the increased uptake in land plants from rising atmospheric CO 2 levels roughly counterbalanced the CO 2 released from cutting down tropical rain forests and other agricultural practices in the decade of the 1980s. In the 1990s, the land biosphere was estimated to take up approximately 1 Pg more CO 2 than it released each year.
Most of the CO 2 released from the burning of fossil fuels and other human activities (e.g., cement manufacturing) is stored either in the atmosphere or in the oceans. The CO 2 that remains in the atmosphere acts as a greenhouse gas, absorbing long-wavelength radiation (heat) in the atmosphere. CO 2 taken up by the oceans does not affect the Earth's heat balance, so an understanding of the air-sea exchange of CO 2 is an essential part of understanding the Earth's climate system and the potential impact of future CO 2 emissions.