A nerve impulse? via the central nervous system? not sure
Answer:
Statements 1, 2 and 4 are correct:
"Hormones can be peptides, steroids, or amino acid derivatives."
"Hormones can stimulate the synthesis of target proteins through the activation of specific genes."
"Hormones can increase the cellular uptake of metabolites."
Explanation:
Hormones are basically proteins that are released under particular conditions to bring about a certain response in the body. They can activate genes and even change how cells respond to metabolites, for instance, insulin and glucagon are two hormones that regulate the level of sugar in the blood. Another example is the hormone adrenaline, which is released in the 'flight-or-fight' response to prepare the body in taking action.
Hope that answers the question, have a great day!
Answer:
In ecology, primary production is the synthesis of organic compounds from atmospheric or aqueous carbon dioxide. It principally occurs through the process of photosynthesis, which uses light as its source of energy, but it also occurs through chemosynthesis, which uses the oxidation or reduction of inorganic chemical compounds as its source of energy. Almost all life on Earth relies directly or indirectly on primary production. The organisms responsible for primary production are known as primary producers or autotrophs, and form the base of the food chain. In terrestrial ecoregions, these are mainly plants, while in aquatic ecoregions algae predominate in this role. Ecologists distinguish primary production as either net or gross, the former accounting for losses to processes such as cellular respiration, the latter not.
