Please help me out if your good at science:)ill mark brainliest if correct A. It helps people stay in touch with friends who live far away.
B. It helps track objects in motion.
C. It helps see microscopic cells at work.
D. It helps diagnose health problems.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.

i believe the answer is three water molecules