Which of the following organisms is a vertebrate?
a. fish
b. insect
c. sponge
d. starfish
which of the following best describes a characteristic that distinguishes animals from plants?
a. plant cells have cell walls containing cellulose, and animal cells lack a cell wall.
b. plants are photoautotrophs, and animals are chemoautotrophs.
c. plants digest their food externally, and animals digest their food inside their bodies.
d. plants reproduce by binary fission, and animals reproduce sexually.

The correct answers are -

1) A.fish

2) A.Plant cells have cell walls containing cellulose, and animal cells lack a cell wall.

Vertebrates are the backbone or spinal cord bearing animals.

There are five classes of vertebrates that are fishes, amphibians, reptiles, birds, and mammals.

Plants and animals are the two different kingdoms of eukaryotes. Plants have cell wall (which is made up of cellulose) around their plasma membrane (cell membrane) whereas animals lack cell wall.

Thus, option A) Fish in the first question is the right answer and option A) in the second part best describes a characteristic that distinguishes animals from plants.

its temperature is increasing. this causes molecular vibrations to increase.