An alien or invasive species can:
a)cause economic or environmental harm
b) cause humans harm
c) have no natural predators
d) all of the above

Look at the punnett square for an x-linked recessive disease. is it possible for a female offspring to have the disease?

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

Food webs - transferring energy and matter from one level to another. here you see four food webs. one or more are incorrect. which food web(s) show the correct sequence of organisms, from start to top level consumer? a) a b) d c) c d) a and d