Chemistry, 29.03.2020 18:14, perezsharisse24
The organism at point W is a bony fish. The organism at point X is a dinosaur. The organism at point Y is a trilobite. The organism at point Z is an amphibian. This diagram suggests that
A.
dinosaurs became extinct before the evolution of bony fishes.
B.
trilobites are the oldest living creatures on the planet.
C.
amphibians are common ancestors of dinosaurs and trilobites.
D.
different species were abundant at different times in Earth's history.
Answers: 1
Chemistry, 21.06.2019 18:30, laurachealsy923
In an energy pyramid, which level has the most available energy?
Answers: 1
Chemistry, 22.06.2019 01:00, mutoni55
Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.
Answers: 2
Chemistry, 22.06.2019 06:30, backup5485
Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line
Answers: 1
The organism at point W is a bony fish. The organism at point X is a dinosaur. The organism at point...
Arts, 08.11.2019 00:31
Chemistry, 08.11.2019 00:31
Advanced Placement (AP), 08.11.2019 00:31