is it advisable to switch the microscope on while looking through the eyepiece

Which statement describes compounds a. compounds are made of one type of atom. b. compounds cannot be represented by models. c. compounds are represented by chemical formulas. d. compounds cannot be broken down into simpler forms.

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?

Support mangrove trees out of the water. a) pneumatophores b) prop roots c) sand dunes d) tide supports