The right option is a. contour interval
The difference in elevation between the highest and lowest contour lines on a topographical map is called contour interval.
A contour interval is the vertical distance between the two contour lines (highest and lowest) in a topographical map. The contour interval is usually stated explicitly on the right-hand lower part in every map. 20 feet for a 1:24,000 map scale is the frequently used contour interval and different contour intervals is available for different maps.
Oxygen.
Oxygen was fatal when organisms started using photosynthesis, this event was known as the Great Oxidation Event.
Answer:
An enzyme attracts substrates to it's active site, catalyzesthe chemical reaction by which products are formed and then allows the products to Daso create separate from the enzyme surface the combination formula by an enzyme and its abstract is is called the enzyme substrate complex.
Lipids are fatty substances thus they release greatest amount of energy more than carbohydrates
