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bixtya [17]
3 years ago
8

To test the efficacy of a health education program in reducing the risk of foodborne and waterborne diseases, the residents of t

wo Peruvian villages were given an intensive health education program. At the end of two years, the incidence rates of important water-borne and food-borne diseases in these villages were compared with those in two similar control villages without any education program. Identify which of the following types of study designs most appropriately characterizes each of the situations described above.
a. Cross-sectional study
b. Case-control study
c. Prospective cohort study
d. Historical prospective cohort study
e. Clinical trial
f. Community trial
Biology
1 answer:
vfiekz [6]3 years ago
8 0

Answer:

sbjsskksebebdnkxknsnskek

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If all living things are related then where did all their differences come from?
stiks02 [169]

Answer:

<em>Hox </em>Gene

Explanation:

First, you're question is very vital, there are many ways in classifying along with identifying all living organisms that includes; morphological analysis, molecular systematics (studying the similarities and differences of the genetic data such in the sequences of DNA, RNA, and rRNA ), homology, cladistics, etc. based on phylogenetic tree, which the study of the evolutionary among various species.

But through it said that all living organisms shared one common ancestor. However, what makes them different from one to another is the homeotic genes that called <em>Hox </em>Genes; which specify the fate of a particular segment or region of the body, meaning the number and arrangements of the<em> Hox</em> genes varies considerably among different types of animals.

For instance, Sponges have at least one homologous to<em> Hox</em> genes, also insects have nine or more <em>Hox </em>genes resulting in multiple <em>Hox </em>genes occur in a cluster in which the genes are close to each other along a chromosome. Therefore, increases in the number of<em> Hox</em> genes have been instrumental in the evolution of many animals species with greater complexity in body structure.

Overall, more <em>Hox</em> genes, more complexity in body structure resulting in the differences of their morphological structure.

Hope that answered your question!

7 0
3 years ago
Please select the word from the list that best fits the definition “a representation of the earths surface”
monitta

Answer: map

Explanation: I say its map because a map represents the entire earth

6 0
3 years ago
Read 2 more answers
1. cells are the basic units of________and_______in all living things.
Ludmilka [50]

Answer:

1. Life, exist 2. pre-existing cells.

Explanation:

3 0
3 years ago
Hi everyone
professor190 [17]

Amino acids are acids on one hand, and a base on the other hand.

<h3>What is an acid?</h3>

An acid is a substance that produces hydrogen or hydroxonium ions as the only positively charged ion when it ionizes.

All amino acids have an amine group -NH_2 and a carboxylic group -COOH.

The carboxylic group ionizes such that:

COOH -- > COO^- + H^+

The presence of the amine group enables amino acids to also act as a base.

More on amino acids can be found here: brainly.com/question/14583479

#SPJ1

8 0
2 years ago
One type of butterfly mimics a dead leaf to evade predators What type of adaptation is this
Margaret [11]
The answer is camouflage<span> it means to disguise the presence of (a person, animal, or object)</span>
6 0
3 years ago
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