Answer:
Hydrogen
Explanation:
Basically, stars are big exploding balls of gas, mostly hydrogen and helium.
A. Protects the seed from damage as it travels
protects the seed not only from mechanical stress but also from microorganism invasion
Answer:
In order to propose a hypothesis, there is a need to first see the function of gills in fishes. The gills of fishes comprise blood vessels that exhibit inherited tendencies of getting oxygen out of the water, which was consumed by fishes from their mouths. These gills also comprise thin walls, and when water moves over these walls of blood vessels, the oxygen from water moves into the blood, and then this oxygen-enriched blood goes to various organs.
Thus, one of the hypotheses in the given case, can be the number of blood vessels, which are found in the gills of the mentioned freshwater fish to be higher in comparison to the blood vessels found in the normal fishes, and apart from this, the surface area of the thin walls, which are found in the gills is also more in the new species of freshwater fish.
The answer is myosin. Myosin are contractile protein the makes up thick filament. The molecule consists of a tail and two myosin heads which bind to myosin binding sites on actin molecules of thin filaments during muscle contraction. Actin on the other hand are contractile proteins that are the main component of thin filament. Each actin molecule has a myosin-binding site where myosin head of thick filament binds during muscle contraction.