Answer:
Cnidarians represent a more complex level of organization than Porifera. They possess outer and inner tissue layers that sandwich a noncellular mesoglea. Cnidarians possess a well-formed digestive system and carry out extracellular digestion.
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A carbon atom can form a maximum of 4 single covalent bonds
Pocket gophers<span> and </span>their<span> ecological cognates worldwide </span>have<span> profound impacts on </span>ecosystems<span>, from consuming vegetation to altering the soil physically. The rodents excavate vast burrow systems and deposit tailings in abandoned tunnels and on the ground surface.</span>
-Crossing over occurs between prophase 1 and metaphase 1 and is the process where homologous chromosomes pair up with each other and exchange different segments of their genetic material to form recombinant chromosomes. It can also happen during mitotic division, which may result in loss of heterozygosity.
I think the correct answer from the choices listed above is the last option. Factors that can increase mutation rates are the UV rays. Different types of radiation cause different types of genetic changes. Ultraviolet (UV<span>) </span>radiation<span> causes point </span>mutations<span>. Excess exposure can risk one's well being.</span>
