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3 years ago

Which of the following is a characteristic of invertebrates?

Biology

1 answer:

julia-pushkina [17]3 years ago

7 0

Answer:

Explanation:

They do not have highly developer senses or surely they don't have a backbone ,every animal that have a backbone isn't an inverterbate.Thy don't have an enclosed circulatory sistem neither

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22. A plant geneticist is investigating the inheritance of genes for bitter taste (Su) and explosive rind (e) in watermelon (Cit

mylen [45]

Answer:

See the answer below

Explanation:

Using the formula for calculating Chi square ( $X^2$ ):

$X^2$ = $\frac{(O - E)^2}{E}$ where O = observed frequency and E = expected frequency.

The observed frequencies for the four phenotypes are 88, 62, 62, and 81 respectively.

For the expected frequency, the phenotypes are supposed to assort in 9:3:3:1 according to Mendel ratio.

Hence, expected frequencies are calculated as:

phenotype (1) = 9/16 x 293 = 164.81

phenotype (2) = 3/16 x 293 = 54.94

phenotype (3) = 3/16 x 293 = 54.94

phenotype (4) = 1/16 x 293 = 18.31

The $X^2$ is calculated thus:

Phenotype O E $X^2$

1 88 164.81 $\frac{(88 - 164.81)^2}{164.81}$ = 35.80

2 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

3 62 54.94 $\frac{(62 - 54.94)^2}{54.94}$ = 0.91

4 81 18.31 $\frac{(81 - 18.31)^2}{18.31}$ = 214.64

Total $X^2$ = 35.80 + 0.91 + 0.91 + 214.64 = 252.26

To the nearest tenth = 252

Degree of freedom = n - 1 = 4- 1 = 3

$X^2$ tabulated = 7.815

The calculated  $X^2$  exceeds the critical value, hence, the null hypothesis is rejected. The two genes did not assort independently. 

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3 years ago

How do you think seasons occur when the moon always changes alignment with the Earth each month? What can be some factors that c

UkoKoshka [18]

Answer: The phases of the moon and the progression of Earth’s seasons are not specifically connected, but they hinge on similar processes: one astronomical body revolving around another. Both phenomena, along with the cycle of day and night, define the most intrinsic of earthly schedules.

Earth, Moon, Sun

The sun is the focus of our solar system, holding in its gravitational pull a collection of satellites that includes the nine planets. Earth, the third planet in distance from the sun, requires a little over 365 days to complete its orbit around the star. Caught in the influence of Earth’s own gravity is its moon, which takes 28 Earth days for its revolution around our planet, and is illuminated by various degrees of reflected sunlight.

Lunar Phases

During its 28-day orbital cycle, the moon rotates on its axis once, and thus presents the same face to the Earth; the “dark side” always points away from the planet. But the moon's appearance changes throughout that orbit in a succession of lunar phases, determined by the moon’s position in relation to the Earth and sun. When the Earth lies between the moon and sun, there is a “full moon." The moon reflects its maximum amount of sunlight at this time. When the opposite configuration is true--the moon is between Earth and sun--the moon is cast in shadow, manifesting as a “new moon.”

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3 years ago

What food security challenge currently facing your community?

Lilit [14]

"What food security challenge currently facing your community?"

Answer:

The report identified a multitude of food-security problems including hunger, obesity, malnutrition, low crop yields, inadequate food storage, poor sanitation, and related political instability.

4 0

3 years ago

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How are the civic lives of average citizens and government related

Marysya12 [62]

Answer:

Civic The concept that civic communities benefit from the active engagement engagement of their citizens and that therefore civic communities have a responsibility to facilitate active citizenship and that citizens have a responsibility to participate actively in their civic communities.

Explanation:

7 0

2 years ago

What is the main cause of extinction on earth today?

Ad libitum [116K]

The main cause of extinction on Earth today is, Humans, we are the biggest
threat to our environments'.

Hope that helps!!!! ( We Humans, are our biggest enemy, and threat to ourselves, and he environment.).

8 0

3 years ago

Read 2 more answers