Explanation:
When a person opens the door, he or she uses 3 systems:
1. Nervous system: from the nervous system, neural instructions are generated through electrical impulses towards the muscles of the upper limb so that they make the necessary movements to open the door.
2. Muscular system: through the muscles of the trunk and the upper limb, it generates voluntary movement to open the door.
3. Skeletal system: the bones are the support of the soft tissues and the fulcrum of most of the skeletal muscles. In this sense, it serves as a support for the muscles of the trunk and the upper limb to carry out the movement of opening the door.
we can conclude that the correct answer is:
Answer:
1. Nervous system: instructions are generated from the nervous system by means of electrical impulses towards the muscles of the upper limb so that they carry out the necessary movements to open the door.
2. Muscular system: the muscles of the trunk and the upper limb generate voluntary movement to open the door.
3. Skeletal system: it supports the muscles of the trunk and the upper limb to carry out the door opening movement. It also has joints that help the mechanical movements necessary to open the door.
Answer:
The reactants are the Products of Photosynthesis which is glucose and oxygen.

Explanation:
The correct option is the first one "Codominance", since both alleles are expressing at the same time.
Answer: The Andromeda galaxy
Explanation:
And that's going to happen someday! The Andromeda galaxy is currently racing toward our Milky Way at a speed of about 70 miles (110 km) per second. Ultimately, the two galaxies will collide and merge.
OPTIONS:A.Capitalism B.Civilization C. Cultural ecology D.The economy E.Environmental anthropology.
Answer: THE ECONOMY
Explanation: Economy is the term used in Anthropology to describe the relationship between the Behaviors of human and the wider environment such as the Geographical,the cultural and historical aspects.
The concept of Economy in Anthropology started around the twentieth century, it helps to analyse and study the economic life of a set of persons or a society,it also tries to show how humans adapt to harsh economic conditions in order to sustain their lives.