What happens during the fall in september?
the sun is at its highest point in the sky.
the northern end of earth’s axis is tilted toward the sun.
the northern hemisphere receives minimal daylight hours.
the sun’s rays are not as concentrated as in summer.

: The Sun’s rays are not as concentrated as in summer

The Sun’s rays are not as concentrated as in summer.

Explanation:

During the fall in September, the Sun passes from northern hemisphere towards equator. Equinox occurs around September 22. On this day, Sunlight directly falls on the equator i.e. the sun crosses celestial equator. Day time is equal to night time in the two hemispheres.  

Thereafter, the daylight decreases in northern hemisphere and increases in southern hemisphere. This is because the sun rays are not concentrated as much as in Summers in Northern hemisphere. In summers, the Sun crosses the tropic of cancer on the day of solstice.

answer: the correct option is d. enzyme

lactase and carbonic anhydrase are the examples of enzymes.

lactase is an enzyme, which is present in the small intestine of mammals. it in the digestion of the disaccharide, lactose ( milk sugar) by converting it into two monosachharide, which are glucose and galactose.

carbonic anhydrase is present in the red blood cells. this enzyme plays significant role in the transport of co₂. it in the conversion of co₂ and h₂o into carbonic acid, which is then dissociated into bicarbonate ions and hydrogen ions.