The short extensions of the cell wall shown in the picture are called

Pili

Since here we are talking about bacterial cell, it contains two kinds of extension commonly- Short : pili; Long : Flagella

Flagella helps in movement of the bacterial cell, whereas pili helps in attachment of the cell to the surfaces. The number of flagella and pili are also different. Pili covers the entire surface of the bacterial cell and they are very thin and short in length.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

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.