Explain why the changes in the verbs ending in -car, -gar, -zar change in yo form only

Because when you are saying yo, you could be talking in present, past, or future tense. The word yo, in the Spanish language, does not specify which tense it is in until we look at the verb in the sentence.

ummmthings that are different in peru than in the united states:

1. granola bars: they are not made of granola. they are made of quinoa and other grains that remind me of the millet i feed my birds at home. they have the texture of styrofoam but are cheap and comparatively healthy.