Please can anyone check if the paragraph about gaseous exchange correct?

Air containing oxygen is inhaled and taken into the alveoli of the lungs. The oxygen diffuses into the blood capillaries and it is taken to the heart. In the cells, oxygen is used for rexpiratory by mitochondria to release energy into the blood and reaches the alveoli in the lungs. Carbon dioxide and water diffuses into lungs and finally passed out through the mouth or nose.

answer: 45

explanationyou have to add as well to be it could be

the correct answer is sex-linked recessive.

i just took the test

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.