Calcula la frecuencia, periodo y velocidad de las siguientes ondas.

20 segs. 1 = 8 km

What are genotypes? what are phenotypes?

Emmet didn’t want to weed the garden. he put off the task toward the end of the day. he even tried to get his sister to do the job. what type of goal orientation did emmet display toward weeding the garden?

How can you tell the difference between rough er from smooth er?