1) the internal balance within an organism is called
a)physiology
b)homeostasis
c) thermoregulation
d) hypothalamus
2) which organism maintain a constant body temperature despite temperature changes in the environment?
a)a frog
b)maple tree
c)goldfish
d)human
3)when leaf has plenty of water
a) the guard cells swell and the stomates open
b)the guard cells swell and the stomates close
c)the guard cell lose pressure and the stomates open
d)the guard cells lose pressure and the stomates close

1. b. homeostasis: The internal balance of heat within an organism is maintained by the process of homeostasis. It is the ability of the organism to maintain the internal body temperature with respect to the changes that occur in the external environment.

2.d) human: The human beings are capable for maintaining the internal temperature due to homeostasis because they exhibit fat which allows them to maintain the internal heat.

3.c) the guard cell lose pressure and the stomata open: The stomata are small pores present on the underside of the leaf surface these are important for exchange of gases and water to the external environment. The water is lost by the stomata of the leaf during transpiration. When the plant requires to remove excess of water from the plant body it is evaporated from the stomata through transpiration.  

b is the best answer for this question.

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: