What two characteristics are present in both a squid and a dolphin but not a jellyfish

There are two major characteristic differences are -

Dolphin and squid are triploblastic while jellyfish is diploblastic,

Dolphin and squid have complex organ systems whereas jellyfish lack it.

Explanation:

Jellyfishes are multicellular, marine organisms of the phylum Cnidaria. Dolphin is a vertebrate organism that belongs to Mammalia. They produce young ones, have complex organ systems. Squids are also marine organism belongs to mollusks. They have 8 arms and tentacles.  

Both squid and dolphin are triploblastic (3 germ layers) and having complex organ systems, while jellyfish is diploblastic (2 germ layers) and absence of complex organ system.

protist eukaryotes that are not plants, animals, or fungi ("misfits")

if the hares very faster than they are now, and thus the lynx's hunting success rate drops because it will be harder to catch them, the rate that will change will be the pray-rate. the pray-rate will change because more hares will be able to survive, thus more individuals for reproduction, so the end result will be increasing population of hares.

the predator-rate will remain pretty much the same because there will be more than enough pray, but the hunting success rate is stagnant.