Answer:
this is point source becuse its cause by human inertaction
Explanation:
In cell signalling, after a signal is sent, signal molecules bind to receptors on target cells and some activity in a target cell changes.
There are three stages in cell signalling :
1. The process of reception occurs when a signalling molecule from the extracellular environment is recognized by a cell. The chemical signal, which is also known as a ligand, is recognized as a signal when it attaches to a receptor protein either on the exterior of the cell or on the interior of the cell.
2. Transduction: This process occurs when the signalling molecule interacts with the receptor, which causes a change in the protein that makes up the receptor. The process of transduction is kicked off by this modification. In most cases, signal transduction occurs through a pathway that consists of numerous stages. The signal transduction route contains relay molecules, each of which influences the subsequent molecule in the pathway.
3. Reaction: In the third and last step, the signal causes a certain cellular response.
Learn more about cell signalling here :
brainly.com/question/14412293
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Be friendly at first with whomever you like, it is easier to get that person as a girlfriend if you have common groind; a friendship so it will be less akward for the both of you then slowly show her things that you like her be able to make her laugh but dont try to hard talk about her to your friends but not on no weird stuff then slowly make your moves like hand holding huggin kisses on the cheek there fore and so on and be protective over her but not possesive you know just show her you care
Answer:
B a consumer or d a carnivore
