To test how fertilizer affects tomato plants, a farmer divided a field of young tomato plants into 10 plots of equal size. The farmer then put fertilizer on half
of the plots and no fertilizer on the other half of the plots. The control group
in this experiment was:

How does an angiosperm prevent self pollination

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an

What environmental cues and landmarks do the geese use to determine the timing and direction of their migration over the mountains? how do they find their way?