For speciation to happen reproductive isolation must occur
The equinoxes signify a change in the seasons. The equinoxes are the main circumstances when the sun based eliminator is opposite to the equator. Therefore, the northern and southern halves of the globe are similarly enlightened. The equinoxes are the main circumstances when the subsolar point is on the equator, implying that the Sun is precisely overhead at a point on the central line.
Yes some can because deep underwater organisms dont even see the light and they still survive
The correct answer is option C, that is, regulate water loss.
Guard cells refer to the cells enclosing each stomata. They assist in monitoring the rate of transpiration by closing and opening the stomata. The guard cells possess the tendency to monitor the closing and opening of stomata by changing shape. The shape of the guard cells modifies on the basis of the concentration of potassium ions and water found in the cells themselves.
The stomatal pores get closed when carbon dioxide is no longer needed for the process of photosynthesis. The guard cells swell when movement of water takes place inside these pores, and thus, the opening of stomatal pores occurs, and as water moves out, the guard cell closes. Thus, guard cells play an essential role in regulating water loss.