2. which pair of structures are homologous?
a. wing of an insect and wing of a bird
b. tentacle of a hydra and flipper of a whale
c. front leg of an insect and bones in the leg of a human
d. bones in the front leg of a dog and bones in the wing of a bat

a, c, d

Explanation:

A dolphin's flipper, a bird's wing, a cat's leg, and a human arm are considered homologous structures, so other structures that are like these can be considered homologous.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

the  different  of  these  two  are  that  they  differently  handle  their  team.

an  expressive  leader  focuses  on  the  task  at  hand  and  make  sures  that  their  goal  is  achieved.  they  accurately  finish  the  task.  an  instrumental  leader  on  the  other  hand  works  on  the  unity  of  the  group,  they  care  more  about  their  employees.  all  the  while  creating  a  good  environment.