What economic system is characterized by an exchange of one product for another
currency
barter
loan
free market

the eggs of the insects should be the first thing collected at the scene.

false

yes, because even though a theory has a  lot of evidence to support it, it is not always true

1)

i))the process of preparing food by green plants in the presence of sunlight is called photosynthesis.

ii) leaf is the site for photosynthesis.

iii) it takes place as,

6h2o+6co2=c6h12o6+602