UN ANIMAL TIENE CIRCULACIÓN CERRADA SIMPLE CUANDO:

a) no tiene hemoglobina b) no tiene sangre

c) la sangre pasa una sola vez por el corazón en un recorrido.

d) la sangre pasa 2 dos veces por el corazón en un recorrido.​

Ecosystems involve living organisms interacting with non-living things in a productive way; how is photosynthesis an example of this? answer, i will give brainiest to first person to get it right.

Amylase becomes denatured at a temperature of 80°c. during an experiment to study the effect of varyingtemperature on enzyme activity, amylase’s reactivity with starch was measured at body temperature (37°c), andthen again at an increased temperature of 42°c. how would this increase in temperature affect the experiment

What contributes to the high level of biodiversity found in wetlands? a. the large amount of available organic matter to organisms that are food for larger organisms b. the amount of available water for organism use c. the high nutrient availability d. all of the above select the best answer from the choices provided a b c d