Answer: B. They are located and bind the steroids in the cytoplasm
Explanation: Steroid hormones are a class of organic compounds, typically lipids. They bind to protein receptors in the cytoplasm or nucleus of the target cell and thus, their receptors are located inside target cells where they function as ligand-dependent transcription factors. This is to say that hormone-receptor complex formed on binding to DNA activates specific genes that increases production of proteins.
The correct answer is - D: Arthropods.
The arthropods (Arthropoda) are a very large phylum, having almost two million species described so far, and there might be even up to 15 times more than that. The arthropods are one of the oldest organisms that still exist. Their most recognizable characteristics are the exoskeleton, fragmented body, and jointed appendages. They only have an other shell, and do not posses internal skeleton, thus making them hard on the outside, and squishy on the inside. The body is fragmented, the number of fragments is differing from family to family, and that is in order for them to have greater mobility. Another characteristic that enables them greater mobility and flexibility are the jointed appendages. They were also the first more complex organisms that got out on the land, and dominated it for quite some time. Unfortunately for them, they do not have the ability to develop their brains on a higher level, thus they were easily outcompeted by the newly emerging groups of animals and fell into their shades.
"Vessels, heart, circulating fluid" are the three components among the following choices given in the question that <span>are common to the circulatory systems of most living animals. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has helped you.</span>
The integumentary system (skin)!