When researchers are measuring plant productivity, they usually harvest and measure above-ground biomass. but with grassland plants, it is common to find that most of an individual's biomass is in its root system. why don't researchers measure below-ground biomass as well? group of answer choices

Awave has a wavelength of 15 mm and a frequency of 6 hertz. what is its speed?

Can happen anywhere along the spine if the neural tube does not close all the way. the backbone that protects the spinal cord does not form and close as it should. this often results in damage to the spinal cord and nerves. a) cleft palate b) spina bifida c) encephalocele d) down's syndrome

The hershey and chase experiments involved the preparation of two different types of radioactively labeled phage. which of the following best explains why two preparations were required? a. the bacteriophage used in the experiments was a t2 phage. b. it was necessary that each of the two phage components, dna and protein, be identifiable upon recovery at the end of the experiment. c. each scientist had his own method for labeling phage, so each conducted the same experiment using a different isotope. d. establishing the identity of the genetic material required observation of two phage generations.