EXTRA POINTS IF YALL GET THIS RIGHT ILL GIVE FREE POINTS AFTER
AND BRAINLIEST TO RIGHT ANSWER

a. 3.

b. 6.

c. 8.

d. 2.

e. 4.

f. 1.

g. 5.

h. 9.

i. 10.

j. 7.

Digestive system: breaks down food small enough to diffuse into the bloodstream (absorption)

Circulatory system: transports material to/from body cells (blood)

Respiratory system: oxygen in the lungs diffuses into the blood (alveoli --> capillaries)

Immune system: protects the body from pathogens that cause disease (ex. viruses, bacteria, fungi)

Excretory system : gets rid of cellular waste products (carbon dioxide, water, urea)

Skeletal system: supports the body, protects organs, produces red blood cells and site of muscle attachment

Muscular system: voluntary movement of the body; helps to circulate blood and move food through digestive tract.

Nervous system: has 3 main functions: sensory, integration, and motor. Sensory. The sensory function of the nervous system involves collecting information from sensory receptors that monitor the body’s internal and external conditions. Integration.

Integumentary System: has an important job for the human body. It provides protection against bacteria and viruses as long as the skin is intact. The skin protects us from UV rays and works with the body to regulate the body’s temperature.

Explanation:

i don't know. if i were you, i would search it up online : d

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).