Answer:
Origin. 20 out of the 36 body plans originated in the Cambrian period, in the "Cambrian explosion", However, complete body plans of many phyla emerged much later, in the Palaeozoic or beyond.
B. Because this shows that the dominant allele will show if a AA(homozygous dominant) x aa(homozygous recessive)
Its because a long spine cacti can reproduce more because it has more survival capacity than the short spine cacti and because of this reason the short spine cacti cannot protect it self because it has a shorter spine that could protect itself from danger.
The characteristic that fish and invertebrates share is that they both can lay eggs.
<h3>INVERTEBRATES:</h3>
Invertebrates are a group of animals that do not possess a vertebral column also known as a backbone or spine, which results from the notochord.
Invertebrates include insects, crustaceans, arachnids, myriapods, mollusks etc.
Fishes, on the other hand are aquatic animals classified under the phylum vertebrata meaning that they possess a backbone.
However, one similarity between fishes and invertebrates is that they can both lay eggs (oviparous mode of reproduction).
Learn more about invertebrates at: brainly.com/question/480297
