Which studies are observational? Select all that apply. A. A worker for the Department of Motor Vehicles compares the age of drivers to the age of the car owned by the driver.
B. A worker for a hospital compares the cholesterol level of patients treated for a heart attack to the patient’s outcome, recovery or death.
C. A researcher used an ice pack to treat migraines for participants in one group and used a standard migraine relief drug with another group
D. A researcher gave one group of dogs food that contained grains and another group of dogs grain-free food and compared how often the dogs in each group scratched their skin.
E. A researcher observed drivers stopping at a toll booth to see if women or men were more likely to be wearing a seat belt.

the answer is 3/5

step-by-step explanation:

first divide 24 divided by 8 because that is the least common multiple

then divide 40 by 8

then you will get 3/5.

the population of other specie of birds will decline or other specie of birds will find some alternate source of food to survive.

explanation:

according to the competitive exclusion principle, which is also known as gause's law, two specie living in the same niche and feeding on the same resource cannot co-exist stably.

as we have well studied the theory of natural selection which states that only those organisms survive which have better tendency to compete for food and adapt to the environmental conditions.

coming towards the question, what wi ll happen when one species outcompetes the other for the small fish , the other specie will not get enough food and will start to die or decline in population. eventually either other specie needs to find another alternative food source for itself or migrate at some other location where there is less competition otherwise it will just not exist anymore at that niche.

hope it !

what's the question?

step-by-step explanation:

there is no question.