The answer is A :)
both horseshoe crabs and spiders produce silk
Answer:
C
Explanation:
The arrows in this food web represent energy flow.
A. The energy of the mongoose is passed on to the hare.
The arrows points from the hare to the mongoose, which indicates the energy moving from hare to mongoose. Therefore,A is not correct.
B. The cheetah supplies energy to a variety of organisms.
There are no arrows that point from the cheetah to another organism. The arrows point from the other animals to the cheetah, indicating the cheetah is a top predator. So, B is not correct.
C. The energy of the acacia tree is passed on to the impala.
The acacia tree passes its energy onto termites, and these termites pass their energy onto the impala. Therefore, C is correct.
D. The aardvark, pangolin, and mongoose are all producers.
This is not true, because these are all animals. Producers are typically plants. Additionally, the producers are usually at the bottom of a food web.
So, C is the correct choice.
Answer:
The pancreas is not part of the respiratory system
Answer:Metals are lustrous, malleable, ductile, good conductors of heat and electricity. Other properties include: ... Hardness: All metals are hard except sodium and potassium, which are soft and can be cut with a knife. Valency: Metals typically have 1 to 3 electrons in the outermost shell of their atoms.
Explanation:
Dating a Fossil As soon as a living organism dies, it stops taking in new carbon. The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced. The carbon-14 decays with its half-life of 5,700 years, while the amount of carbon-12 remains constant in the sample. By looking at the ratio of carbon-12 to carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely. A formula to calculate how old a sample is by carbon-14 dating is: t = [ ln (Nf/No) / (-0.693) ] x t1/2 where ln is the natural logarithm, Nf/No is the percent of carbon-14 in the sample compared to the amount in living tissue, and t1/2 is the half-life of carbon-14 (5,700 years). So, if you had a fossil that had 10 percent carbon-14 compared to a living sample, then that fossil would be: t = [ ln (0.10) / (-0.693) ] x 5,700 years t = [ (-2.303) / (-0.693) ] x 5,700 years t = [ 3.323 ] x 5,700 years t = 18,940 years old Because the half-life of carbon-14 is 5,700 years, it is only reliable for dating objects up to about 60,000 years old. However, the principle of carbon-14 dating applies to other isotopes as well. Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years. Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years). The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy.
