Evolution occurs due to changes in time of the allele frequencies within a population. True
False

Si las frecuencias permanecen constantes  de una generación a la siguiente, la población no experimenta un cambio evolutivo.

If the frequencies remain constant from one generation to the next, the population does not undergo evolutionary change.

the answer is a or when it says crossing over

enhanced global partnerships and exploration capabilities may advance international preparedness for protecting the earth from catastrophic events such as some asteroid strikes, advancing collaborative research on space weather and protecting spacecraft by developing new means for space debris removal.