Answer: circulatory is when ur blood circulates and respiratory is the system we use to breath if I remember correctly
Explanation:
Answer:
Competition for food happens when there is a limited amount of food resources available. The members of a species that eat that food who are best adapted to access the food are more likely to reproduce and pass on their genes to the next generation.
For example, we have a bird feeder with a narrow opening for food. The small-headed birds can reach the food, the bigger-headed birds cannot. If this was the only food source for this area, then over time, there would be more smaller-headed birds than large-headed birds, due to the competition for food and success/lack of success.
There were more dark moths around factories because trees were darker near factories because of pollution. More light moths were found in the country away from the factories, in the forests with no factory pollution