The part of the brain responsible for speech, thought, and memory is the
medulla
cerebellum
cerebrum
thalamus

The correct answer or option is cerebrum The cerebrum, also called cortex is the largest part of the brain. It is divided into four sections, called lobes and these are the frontal lobe, the parietal lobe, occipital lobe and temporal lobe.

Front lobe helps in speech, reasoning, planning, movement , emotions and problem solving.

parietal lobe helps in orientation, and perception of stimuli and movement.

Occipital lobe  helps in visual processing.

Temporal lobe helps in memory, speech as well as perception and recognition of auditory stimuli

spiders belong to a group of arachnids.

arachnids have the following traits :

they have two body parts.

they have eight legs unlike insects which have 6 legs.

they have no wings.

these traits distinguish them from insects.

the information that antonio is doubting us the statement that spiders differences are as a result of being first to evolve.

this is because the evolution of one species is independent of the other species.

this is a good question! i'll do some research and come back when i have the answer!