QUICK I NEED THE ANSWER!! Compare the symmetry of an echinoderm to the symmetry of worms

A. Both echinoderms and worms have bilateral symmetry

B. Echinoderms have bilateral symmetry and worms have radial symmetry

C. Echinoderms have radial symmetry and worms have bilateral symmetry

D. Both echinoderms and worms have radial symmetry

C.Echinoderms have radial symmetry and worms have bilateral symmetry

Explanation:

Echinoderms evolved from animals with bilateral symmetry. The larvae of all echinoderms are bilaterally symmetrical but lost during metamorphosis  developing into radial symmetry adult. Examples of echinoderms are  starfish, sea urchins, sand dollars.

Worms are invertebrate animals having bilateral symmetry. They have a definite anterior (head) end and a posterior (tail) end. Worms have brains that help them detect objects, food,  mates, and predators quickly.

when the volume of gas is   changed from   717.73 ml   to 852 ml   the temperature will   change   from 315   c to 452   c

    calculation

this is calculated using the charles law formula

that is,   v1/t1 = v2/t2

          v1=?

        t1 = 315 c   into   kelvin = 315 +273 = 588 k

        v2 = 852   ml

        t2 = 425c + 273 =698 k

make v1   the subject of the formula ( by   multiplying both side by t1)

  v1=( v2 xt1) / t2

v1= (852 ml   x 588 k)/ 698 k= 717.73 ml

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.