An igneous rock floats because air bubbles became trapped when molten material erupted from an underground volcano.

how else can this rock be accurately described? check all that apply

intrusive
extrusive
small crystals
cooled quickly
coarse texture

Hummingbirds drink nectar from flowers, while robins eat plant seeds. what does this reduce?

Afamily has a y-linked disease that affects the father. what is the chance of a male offspring inheriting the same disease? oa. 100% ob. 50% oc. 25% d. 0%

The human genome project is devoted to mapping the general dna sequence of our species. this could lead to the development of new medicines, as well as the possibility of using gene therapy to treat certain diseases. however, there are some ethical issues surrounding the mapping of individual genomes. one concern is a) that your genes may change over time, making the project useless. b) that insurance companies could discriminate based on genetic make-up. c) that since this has never been done before, we should probably not do it now. d) that sequencing our individual genomes is so expensive, it is a counter-productive strategy.