<span>The
difference in structure of the antennae and antennules is their size or length.
Antennae are long sensory organs while antennules are short or small sensory organs. These
organs are connected to the head of an insect, crab, or other animal and they
are used for taste, balance, smell, touch, air motion and vibration</span>
B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Here we have to find the diameter of nucleus as the
diameter of atom is given.
Diameter of atom is 1 x 10⁻⁸ cm
Radius of atom = diameter/2
so, radius of atom = 1 x 10⁻⁸ cm/2
= 5 x 10⁻⁹ cm
To find diameter of nucleus, first we have to find the
radius of nucleus by using this formula,
R = rA⁽¹/³⁾ where <span>R = radius of nucleus, r = radius of atom and A is a nucleon
number, which is different for every atom
so, R=(5x10</span>⁻⁹)A⁽¹/³⁾
here atom is not mentioned, so we don't know the value of A
and Dimeter (D) = 2R, R = D/2
D/2 = (5x10⁻⁹)A⁽¹/³⁾
Diameter of nucleus (D) = 2((5x10⁻⁹)A⁽¹/³⁾)
The correct answer is Option D
Reason - Since the two species live in the separate geographical area i.e different ponds they will evolve different traits and characteristics due to geographical diversity Thus any kind of isolation produced with in a species due to change in their spatial entity is called geographic isolation.
Answer:
hope that helps!!!!!!!!!!!!!!!!!!!!