Why is there an e at the end of the word difference?

Which of these words contains a consonant blend, consonant digraph and a short vowel sound?

Select the true statement for each of these syllable types: An r-controlled syllable A vowel team syllable A magic-e syllable A closed syllable

Prairie dogs infected with Yersinia pestis (bubonic plague) are a continual source of human exposure to these pathogens.  The prairie dogs are an example of a/an ________. 

Which of the following is a true characteristic of co-repressors?

Select all the words that contain a diphthong.

Tears are a part of which of the body’s lines of defense against pathogens?

Superoxide dismutase is involved in _______

Why is there an e at the end of the word bridge?

By which process do most bacteria reproduce?