Answer:
D
Explanation:
Clams naturally filter out contaminants in water
Without the clams, the water quality will drop dramatically, as the local ecosystem will lose its natural filtration system
Answer:
Explanation:
Acetylcholine (ACh) is an organic chemical that functions in the brain and body of many types of animals (and humans) as a neurotransmitter.
Neurotransmitter is a chemical message released by nerve cells to send signals to other cells, such as neurons, muscle cells and gland cells.
After a neurotransmitter molecule has been recognized by a post-synaptic receptor, it is released back into the synaptic cleft. Once in the synapse, it must be quickly removed or chemically inactivated in order to prevent constant stimulation of the post-synaptic cell and an excessive firing of action potentials.
Some neurotransmitters are removed from the synaptic cleft by special transporter proteins on the pre-synaptic membrane. These transporter proteins carry the neurotransmitter back into the pre-synaptic cell, where it is either re-packaged into a vesicle and stored until it is once again needed to transmit a chemical message, or broken down by enzymes.
Answer:
C. A plant absorbing carbon dioxide during photosynthesis
Explanation:
Carbon assimilation occurs when inorganic carbon (carbon dioxide) is converted to organic compounds by living organisms such as plants.
Let's analyze each choice;
The respiration of a animal - Respiration
A factory burning fossil fuels- Combustion
A plant absorbing carbon dioxide during photosynthesis- assimilation or fixation
Fossil fuel deposits - from decay of dead organisms and waste products.
Answer:The DNA of bacterial cells is found loose in the cytoplasm. It is called chromosomal DNA and is not contained within a nucleus.
Explanation:
