This is a cell, which is the basic unit of all life. all organs in human bodies are made of cells and require oxygen to survive. which two systems work together to deliver oxygen to cells throughout the body?

Answer:

Respiratory and circulatory system are two systems work together to deliver oxygen to cells throughout the body

Explanation:

The circulatory system releases the nutrients as well as the oxygen to the different cells of the body. It also comprises of heart and blood vessels which are also spreads throughout the body. In this process arteries helps to take away the blood from the body whereas the veins takes it back to the heart. In similar manner respiratory system also helps in delivering oxygen to the cells. It takes the oxygen from the environment, and delivers it in the blood stream and gives out the carbon dioxide from it.  

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation:

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.