I think it's A or C not quite sure but i hope you do well.
Answer:Phase change materials (PCM) are substances that absorb and release thermal energy during the process of melting and freezing
Explanation: when it cools it changes like ice melting
The Voynich manuscript is an illustrated codex hand-written in an unknown writing system. ... The manuscript is named after Wilfrid Voynich, a Polish-Samogitian book dealer who purchased it in 1912. Some of the pages are missing, with around 240 remaining.
Probably 1968
hope it can help u
Answer:
Controversy over slavery
Explanation:
The Treaty of Guadalupe Hidalgo ended the Mexican American war and gave the U.S. land, including California. The effects of this treaty were opposed by some, mostly by Whigs. It resulted in more debates for the expansion of slavery and what states would be free for the time being. It contributed to tension between the North and South prior to the Civil War. :)