Immigration followed by competition
I hope this right, if its not, sorry =)
Answer:
subtitution mutation
Explanation:
The T in the middle is subtituted with C.
Hope it helps.
Answer:Because they keep on repeating.
Explanation:
The answer is a simple radial nervous system.
Echinoderms do not have brains. Around their mouth, they have central rings from which nerves radially run into arms and along the body. Movement is controlled by the branches of those radial nerves.
