In the human body, organ systems interact in order to maintain homeostasis. Which list below represents one organ system from most complex to least complex?

Small intestines, epithelial cells, smooth muscle cells, digestive system

Muscle cell, cardiac muscle tissue, heart, circulatory system

Nervous system, brain, nervous tissue, neurons

Excretory system, kidneys, epithelial cells, urinary bladder

I NEED ANSWERS ASAP!

Which statement best describes a keystone species? o a. it has littlelmenetic variation. it has an extremely high population. 0 b. 0 c. it remains unaffected by all environmental changes. od. it has a strong influence on the ecosystem. 0 e. it's the first species to populate a new ecosystem.

Which of the following is an example of competition that could be found in a forest? question 14 options: deer eat berries and their droppings seed new areas creating more berry bushes two fox populations utilize the same rabbit population as their main food source two hawk populations utilize the same scorpion population as their main food source lack of sunlight due to changes in the seasons restricts the growth of certain plants

How have high taxes on tobacco products impacted the number of people who use them? a. the number of tobacco users has increased. b. the number of tobacco users has decreased. c. the number of tobacco users has not changed. d. the number of adolescent tobacco users decreased, while the number of adult users increased