Which aspect of Dr. Williams's life is emphasized in "Healing a Wounded Heart: Daniel Hale Williams" but not in "A Concise, Yet a Very Interesting Biographical Sketch of Dr. Williams, of Chicago, Ill"?
O the loss of his father at a young age
o his work providing health care for orphans
O his performing the first successful heart surgery
O the education he received through high school

WHO IS RIGHT I WILL GIVE BRAINLIEST

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

When balancing a chemical equation:

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.