Answer:
D
Explanation:
its scientifically proven that water covers over 70% of the human system
Answer:
Cell theory- all living things are made of one or more cells,that cells are the basic unit of life,and that cells come only from other cells
Explanation:
It would be the first one because a cell theory is that all living things are made of one or more cells
Tr
One allele from each pair
Answer:
Explanation:
This is the process of muscle contraction and relaxation in the muscle. The type of muscle involved is the skeleton muscle.
The process is initiated in the Central nervous system. Examples are in contraction of biceps and triceps.
It involves myosin head and actin filament coupled with the release of calcium ion from the sarcoplasm reticulum: this ion activates this process in the muscles. With the exposure of the music binding site on the acting filament, myosin is able to bind to acting filament bringing about this process.
a. ATP attaches to myosin head
b. Myosin head is re-energized
c. Myosin head forms cross bridge with actin
d. Power stroke moves thin filament
e. Cross bridges detach from actin
f. Myosin binding sites covered
g. Calcium ions pumped into the sarcoplasmic reticulum
h. Calcium ion concentration decreases below the threshold for binding to troponin.
Extinction events often clear niches out to make way for other species.
The species that survive an extinction event will pass on the genes that allowed them to survive onto their offspring, which causes the species to gradually evolve.
