PlZZZ HELP ME ON MY SCIENCE TEST ASAP I NEED THIS

If bacteria are much too small to see, what is one reason why can we see colonies in the petri dishes that have plenty of food to eat after only a few days?

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?

This is collection of data made by comparing objects in standard units. in science, the units are metric.