What four characteristics are held by ALL chordates at least in the embryological stage?

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

Iwill give brainiest to first person who gets it ! what are 3 basic types of interactions we see in an ecosystem?

Name the following: (a) category of pathogen that causes diseases, like common cold and mumps. (b) the microorganism that requires a host to produce.