Arrange the trophic in ascending order starting from the base of the ecological pyramid of energy and increasing to the top.

• secondary consumers
• herbivores
• producers
• apex predators

What protects the lining of the stomach from acidic gastric juices?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

Plz ! for many generations farmers in north america have been choosing to cross corn plants with large ears of corn each year this results in the new generation of plants also growing large ears of corn. what is the technique called? a. selective breeding. b. natural selection. c. mitosis. d. asexual budding.