The biological species concept is A) applicable to all forms of life, past and present.
B) applicable to all present life-forms but not to fossil organisms whose reproductive behavior cannot be observed.
C) easy to apply to all present sexually reproducing organisms but harder to apply to asexual organisms and fossils.
D) sometimes difficult to put into practice even for present sexual organisms and useless for asexual organisms and fossils.

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Which of the following describes research that would be considered basic science? a. a farmer is trying to improve his crop yields by using a new kind of fertilizer. b. a college students is curious about the growth of desert pants in the presence of excess amounts of water. c. government officials are trying to prevent the spread of new strain of influenza virus. d. a doctor is trying to determine why a patient is feeling tried and sick.b.a college students is curious about the growth of desert pants in the presence of excess amount of water