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Tpy6a [65]
3 years ago
10

Ned is designing an experiment to test which hand sanitizer kills the most E. coli bacteria. In order for Ned's results to be va

lid, what must he do?
Biology
2 answers:
Kay [80]3 years ago
7 0
Have a control. You have to have something to compare your experimental results or else your results could be random chance. 

kondaur [170]3 years ago
7 0
Test the hand sanitizers on bacterial colonies that are kept in the exact same environmental conditions, such as temperature and light level
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Power is the amount of work done in a certain period of time.

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A forest was cleared for the building of a resort, but before construction began, secondary succession set in. Which of these de
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D) the soil components remained for plants to grow.

Explanation:

The soil components that is remained after the removal of the forest provides a nutritive medium for the faster growth of plants. The faster rate of secondary secession occurs due to the presence of nutrients in the soil which ultimately increases the growth of the plants. The soil components has roots, seeds and other biotic organisms of the previous plants that is decomposed by the decomposers and provides nutrients to the plants.

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an organelle found in most eukaryotic cells describe the cellular power plants because of their primary function is to convert o
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A sexually reproducing animal has two unlinked genes (on separate chromosomes), one for head shape (H) and one for tail length (
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Answer:

a) HT

Explanation:

This question shows an animal with two distinct unlinked genes i.e. on different chromosomes. One gene codes for head shape and the other for tail length. The gene for head shape possess alleles H and h, while gene for tail length possess alleles T and t.

According to Mendel's law of independent assortment, the alleles of a gene will separate into gametes independently of the alleles of another gene. This occurs in such a way that each gamete will contain only one allele from a gene.

Based on this principle, an animal with genotype HhTt will undergo meiosis and randomly produce gametes with the following allelic combinations: HT, Ht, hT, and ht. As seen in the gametes, only one allele of a gene occured in a gamete at a time.

Therefore, HT is the genotype possible in a gamete of parent: HhTt.

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