A covalent bond is formed when atoms share valence electrons. Which group of elements form covalent bonds?

How many copies of each chromosomes should be present in each of the 4 final haploid versions of gamete?

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?