b. about every 1500 years
c. about every 2000 years
d. about every 2500 years
B. about every 2000 years
B. their digestive structures.
C. their cellular structures.
D. how they reproduce.
help;)))))))
Answer:
The minute hand moves radians.
Step by step explanation:
We know that measure of complete circle is 360 degrees.
In a clock a complete circle means 60 minutes.
The minute hand move from 1:25 to 1:50, it means the minute have cover 25 minutes.
Therefore minute hand moves 150 degree.
Multiply to convert degree into radian.
Therefore the minute hand moves radians.
The right answer is C. +1 (for hydrogen).
The hydrogen atom can lose its single electron to give the H + ion, commonly referred to as the proton name. In fact, the atom which has lost its only electron is reduced to its nucleus, and in the case of the most abundant isotope 1H, this nucleus consists only of a proton. This name is not strictly correct if one takes into account the presence, although discrete (less than 0.02%), of the other isotopes. The name hydron is more general (we also say hydrogen ion, despite the possible confusion with the H- anion).
Answer:
C. +1 (for hydrogen).