Which of the following gases is not found in earth’s atmosphere?
a. oxygen
c. hydrogen
b. nitrogen
d. all of the above are in the atmosphere

What must be done to breed dogs for a partical trait

One function of the immune system is to attack the foreign cells to protect the body. in organ translate , the body recongnizes that the new organ is made of foreign cells. wha kind of medicine would you give a patient to increase the chances of transplate success

Which of the following situations describes a adaptation for a mole? question 2 options: a mole is blind and cannot see underground. a mole is bright and attracts the attention of predator birds. a mole has a sensitive sense of smell to it find food underground.