Ques:Answer the following question given this paragraph: Imagine walking in the forest in Figure below . The towering trees have been growing here for hundreds of years. It may seem as though the forest has been there forever. But no ecosystem is truly static. The numbers and types of species in most ecosystems change to some degree through time. This is called ecological succession. Important cases of ecological succession are primary succession and secondary succession. Q: The numbers and types of species in most ecosystems change to some degree through time and this is called? Choices: - physiological succession - continuous succession - environmental succession - ecological succession A:

Ans:ecological succession
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Ques:Answer the following question given this paragraph: What happens when there are two alleles in a heterozygote and neither allele is completely dominant nor completely recessive? Can both traits appear in the phenotype? Essentially, yes they can. Can there be two dominant alleles for the same gene? Codominance occurs when both traits appear in a heterozygous offspring. For example, roan shorthorn cattle have codominant genes for hair color. The coat has both red and white hairs; not pink hairs, but red AND white hairs. The letter R indicates red hair color, and R' white hair color. In cases of codominance, the genotype of the organism can be determined from its phenotype. The heifer in Figure below shows both coat colors and therefore is RR' heterozygous for coat color. The flower in Figure below also has two codominant alleles; it has red and white petals, not pink petals. Both colors appear in the phenotype. Q: What is said to occur when both traits appear in a heterozygous offspring? Choices: - identical twins - pollenation - xenophobia - codominance A:

Ans:codominance
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Ques:Answer the following question given this paragraph: Most ecosystems get their energy from the Sun. Only producers can use sunlight to make usable energy. Producers convert the sunlight into chemical energy or food. Consumers get some of that energy when they eat producers. They also pass some of the energy on to other consumers when they are eaten. In this way, energy flows from one living thing to another. Q: Where do most ecosystems get their energy from? Choices: - earth - heat - water - sun A:

Ans:sun
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Ques:Answer the following question given this paragraph: A machine is any device that makes work easier by changing a force. When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force. Recall that work equals force multiplied by distance:. Q: A machine is any device that makes work easier by doing what? Choices: - moving things - changing molecules - removing barriers - changing a force A:

Ans:
changing a force
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