Answer:
ice
Explanation:
bc ice changes a solid to a liquid when it melts
Pharyngeal arches are organs that only invertebrate chordates have. The only invertebrate chordate among these options is C. sea star, also known as starfish, so I would say that is the organism that develops breathing organs from pharyngeal arches.
Well lack of competition LEDS TO> lots of variation which LEDS TOO> speciation
I hope that helps
Purines and pyrimidines are the nitrogenous bases found in the genetic material. Purines include Adenine (A) and Guanine (G) while pyrimidines include Thymine (T), Cytosine (C) and Uracil (U). Purines always pair with pyrimdine and keeps the strands of DNA at the same distance. THIS IS BECAUSE, PURINES ARE DOUBLE RINGED STRUCTURES AND PYRIMIDINES ARE SINGLE RINGED STRUCTURES. PAIRING OF PURINES WITH PYRIMIDINES MAINTAIN THE STRUCTURE OF THE DNA.