Ww is heterozygous
WW is homozygous dominant
ww is homozygous recessive.
So basically upper case letter show dominant, lowercase show recessive. Homo means that they are the same, hetero means that they are different.
Hope this helps:)
The answer is number two I believe
The Cell Wall protects the cell from particles outside.
Answer:A. The release of calcium ions causes myosin and actin to attach to each other.
The contraction of skeletal muscles takes place by induction of a nerve impulse, which produces a movement and the interaction of the filaments containing proteins named as actin and myosin. This interaction of filaments is regulated by proteins called tropomyosin and troponin present on the actin filaments. The motor nerve causes the depolarization of the muscle membrane sarcolemma. This triggers the sarcoplasmic reticulum to release calcium ions. This calcium binds to troponin and thus allows the tropomyosine strand on the actin filament to displace so that the part of the actin where myosine head needs to be attached remain uncovered. Binding of the actin myosine filament results in contraction.
Hence, the release of calcium ions causes myosin and actin to attach to each other causes muscle contraction.
Answer:
air resistance or drag, (Option B)
Explanation:
