Question

Oxygen is required by almost all organisms for the process of

and is a by-product of
(d) The population that an ecosystem can support continuously is called its

Answer 1

1.) a.) cellular respiration

b.) photosynthesis

2. carrying capacity

Step-by-step explanation:

I'm a little confused by the question, but I think this is what you're asking:

Oxygen is required by almost all organisms for the process of cellular respiration and is a by-product of photosynthesis .

d.) The population that an ecosystem can continuously support is called its carrying capacity .

An ecosystem's carrying capacity is determined by the limiting factors present in the system. These limiting factors are broken into two broad categories, abiotic and biotic. Abiotic factors are those which do not include living organisms (sunlight, water, etc.). Biotic factors represent the organisms in the ecosystem necessary for the survival of the target population (such as the food web that supports heterotrophic organisms).