Arachnids are spiders,
spiders have 8 legs,
a pair is 2,
so, arachnids have 4 pairs of legs.
The acetabulum is the cup-like structure where the femur articulates. The head of the femur is the specific structure which articulates in the acetabulum.
Answer: Altricial young are born helpless and require care for a length of time. Altricial birds include herons, hawks, woodpeckers, owls, cuckoos and most passerines. For example, with ground-nesting birds such as ducks or turkeys, the young are ready to leave the nest in one or two days.
Explanation:
In fixation, the first stage of the Calvin cycle, light-independent reactions are initiated; CO2 is fixed from an inorganic to an organic molecule. In the second stage, ATP and NADPH are used to reduce 3-PGA into G3P; then ATP and NADPH are converted to ADP and NADP+, respectively.
Hydrogen bonding is a weak type of bond that occurs between two hydrogen atoms that are covalenty bonded to a very electronegative atom such as flourine, oxygen and nitrogen
