Unit test
Which of the following is true regarding positive and negative feedback?
Choose 1
Positive feedback is triggered by internal sources and negative feedback is trigger
external sources.
Positive feedback amplifies signals and negative feedback opposes signals.

Which blood cell spend most of their time in the lymphatic system?

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.

Por qué crees que los huevos con cáscara se llaman amnióticos?