Why the DNA sister strands are complementary but not identical?

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false

Aremote community desperately needs more electrical energy. it is located in an area with the following characteristics: average wind speed of 15 – 20 km/hr some medium-sized rivers with slow-moving currents few coal deposits some oil exploration being conducted within 400 miles based on the above information, which energy source would be the most economical and safest for the community to pursue? a. fossil fuel b. hydroelectric c. nuclear d. wind