Punctuated equilibrium has been a theory in evolutionary biology developed and coined by Stephen Jay Gould which talks about very rapid changes which occur in nature while on the other hand still having a lot of stable periods with plenty of change in general.
The correct answer for that reason would be B.
A when volcanoes irrupt I think
the factors are light intensity, carbon dioxide concentration and temperature. So you know which one is.
Answer:
D. Each receptor triggers one particular type of cell behavior, for example, activating gene expression.
Explanation:
- Each extracellular signal molecule can induce different responses depending on the target cell.
- Lipophilic receptors diffuse or carried across the cell's plasma membrane and bind to an intracellular receptor. For example steroid hormones are transported via carrier proteins.
- Some signalling molecules only induce response from specific cells.
- A single receptor can be activated by different signal molecules.
