Sodium bicarbonate and digestive enzymes.
Answer:
the last one which I'm guessing is d......cause it kinda messed up
Sexually because human need to have sex in order to create a child in their bodies
Answer:
keystone species
Explanation:
Keystone species are indispensable species that are essential to the maintaining of the balance of an ecosystem, and also play a major role in the way species in the ecosystem interrelate. The absence or removal of a keystone species from a habitat or ecosystem would lead to the disruption and imbalance of the ecosystem, and as such lead to the extinction of other species.
An example of a keystone species is the bee. Bees are very important in pollination of flowering plants and also ensure their survival. This plants serve as home to various insects that are source of food to birds. The removal of bees from this ecosystem would affect the ecological balance of this ecosystem.
1. right atrium
2. aortic valve
im not sure if that is the answer
thats what i got
