Solution & concentration
Solution Salt particles Sugar particles copper ions
1 10 20 10
2 20 10 5
3 20 10 20
4 5 20 10

Each solute in the table is mixed in a volume of 500 mL of water. Organize the solutions from least conductive to most conductive.

A) 4, 2, 1, 3
B) 4, 1, 2, 3
C) 2, 4, 3, 1
D) 1, 3, 4, 2

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

Astudy by solloch and et. al., in 2017, gives the map above which shows the frequency of alleles with a ccr5-delta32 mutations over 87 different countries. this mutation deletes the presence of a co-receptor (ccr5) on the outside of human t-cells (lymphocytes). some viruses, such as the one responsible for the black death and human immunodeficiency virus (hiv), require this receptor for attachment to host cells during the infection process. the black death was an epidemic that passed over northern europe during the 14th century killing nearly 60% of europeans. according to this information, which explanation best explains why northern europeans show a greater immunity for hiv than some other parts of the world?

Albinism is an autosomal recessive condition. which circle graph above shows the genotype probability when an albino female mates with a male that is heterozygous for the albinism trait? answer choice f answer choice g answer choice h answer choice j