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Regarding to the following B+Tree(m=3), If we delete index key = all 5s, all 2s, insert 4 and 1, what is the B+Tree index after the operations?                                                         (5 Points)  (Note: please show each step, not only final answer). Please upload file to answer the question.  

Given query: Find all the names and phone numbers of the student who take classes in Summer 2025 and in ‘Biology’ department.         A.) Create the SQL command for this query? (3 Points)         B.) According to the SQL command, create the relational algebra expression? (3 Points)         C.) According to relational algebra expression, create an optimized relational expression tree? (4 Points)  Please upload file to answer the question.

Deadlock will be occurred in schedule S3? (True/False)

T1 writes Ra2, T2 writes Rb1, T3 reads Fa and writes Ra1, T4 reads Fb.      (4 Points)  0 _______ 1 _______ 2 _______ 3 _______ 4 _______ 5 _______ 6 _______ 7 _______ 8 _______ 9 _______ 10 _______ 11 _______ 12 _______ 13 _______ 14 _______ 15 _______ 16 _______ 17 _______ 18 _______ 19 _______ 20 _______ 21 _______ 22 _______ 23 _______

Biologists hypothesize that the first animal evolved from colonies of protists in ancient seas.

Read the riddle and match it to the correct animal phylum:  

All chordates share four fundamental features as seen in the below figure of a juvenile frog. Match the chordate trait to its human equivalent:

Click on an example of radial symmetry from the following three ogranisms:

Complex cells evolved from simpler cells, and this was a significant event in the history of life!

Click on the following bacteria that represent the common cocci shape.