Which characteristic is common in mature rivers? (apex)
a. a straight, narrow, v-shaped channel
b. location near headwaters
c. a steep stream gradient
d. many tributaries

The population of bacteria in a petri dish doubles every 40 seconds. the population of the bacteria is initially 400 organisms. what unit is most appropriate for the time at which the number of bacteria is 300? hour bacteria per hour second bacteria per second

Plz genetic engineering can be applied to many fields including medicine and agriculture. which of the following is a medical application of genetic engineering? a. giving crop plants recombinant dna so that they would be resistant to herbicides. b. examining a persons pedigree to determine whether they can carry a gene for a genetic disease. c. analyzing a persons dna to see how closely they are related to another person. d. certain genes into bacteria so that they will produce a needed medicine.

This group of organisms perform the process of ammonifcation. a. herbivores b. decomposers c. carnivores c. plants