True or false paleolithic people probably lived in small nuclear family units

The given statement is false, as Paleolithic people thrived in the groups of 20 to 30 individuals.  

At the time of Paleolithic, the hominins gathered together in brief societies, like bands, and survived by fishing and gathering plants, scavenging or hunting wild animals. The Paleolithic era is featured by the application of knapped stone tools, however, tools made up of woods and bones were also used by humans at that time.  

the answer is 1. photosynthesis. glad to

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.