What is produced in the compact bone? skin, oxygen, blood, nutrients

The compact bone is involved in blood production along with the spongy bone.

The compact bone is the fundamental structure in the body for help, protection, and development. Because of the solid idea of smaller bone, contrasted with elastic bone, it is the favored tissue for quality.  

Spongy bone is utilized for progressively dynamic elements of the bones, including platelet generation and particle trade. Be that as it may, conservative bones likewise serve a capacity in putting away and discharging calcium to the body when required. The minimized bone additionally gives solid mechanical switches, against which the muscles can make development. This capacity is upheld by the joints made by light bone and connective tissues, for example, ligaments and tendons.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.