What is a notochord?

In cephalochrodates , notochord

Which of the following statements is incorrect about notochord ?

Read the following statement and select the correct option : (a) In lancelets notochord extends from head to tail region and is througout their life . (b) In tunicates ,notochord is present only in the larval tail .

What is a cyclone ? What are the other names for it ?

What is an error? What are constant errors?

What is the plant shown in the figure ? What is made of it ?

Bilaterally symmetrical, triploblastic animals with coelom and notochord belongs to

Match the columns and select the correct option . {:(Column-I,Column-II),((a)"Chondrichthyes ",(i)"Tympanum"),((b)"Osteichthyes",(ii)"Beak"),((c)"Amphibia",(iii)"Operaculum"),((d)"Reptilia",(iv)"Hair"),((e)"Aves",(vi)"Persistent notochord"),((f)"Mammlia",(vi)"Scales or scutes"):}

What is hypothesis? What are variables?