Only land animals can leave traces - the first animals were too big to preserve d question 4 0.34 pts an animel o must live on land o is a single-celled organism was the first form of life on the earth ois a prokaryote o has specialized cells d question 5 0.33 pts what was one evolutionary advantage that conifers had over seed ferns? greater tolerance to cold conifers are single-celled organisms ability to grow on land conifers have flowers and fruit ability to photosynthesize d | question 6 0.33 pts why are fossils from the beginning of the phanerozoic eon easier to find than fossils from the proterozoic eon? life on earth only appeared in the phanerozoic fossils can only happen to land animals, which only appeared in the phanerozoic no rocks from the protozeroic eon are currently present on earth there were only prokaryotes before the phanerozoic many organisms started to have skeletons, shells, rigid coats and other hard parts in the phanerozoic but not in the protozeroic question 7

answer; /// i do believe that the correct answer is (c)nuclear bond

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

distance, luminosity, brightness, radius, chemical composition, and temperature