Sienna grabbed her coat and umbrella because the dark sky and looming clouds seemed to promise rain. the word "because” is acting as what type of signal word in the sentence? a. sequence b. continuation c. cause and effect d. compare and contrast

I think the answer would be C. Cause and effect. We can find this out by seeing that the sky was dark and looked like it was going to rain. Because of the sky being dark and looming, Sienna grabs her coat and umbrella. I hope this helps :) 

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.

Question 4 i think is expository