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3 years ago

True or false the period of an element is the amount of time It takes for half of a radioactive isotope to decay

Biology

1 answer:

Arlecino [84]3 years ago

3 0

I think its false but im not too sure

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True or false: most flowers have a trunk

Ahat [919]

Answer:

Showy orange flowers that develop on the main trunk and limbs. Halleria lucida, a shrub from South Africa, is in the family Scrophulariaceae. So this statement would be true.

8 0

2 years ago

When studying animal behavior, the distribution of organisms within a choice chamber can be studied to identify animal preferenc

Komok [63]

Answer:

Explanation:

Random distribution of the Isopods should be 50/50 in A and B.

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

Chamber O E Chi-square

A 18 10 $\frac{(18 - 10)^2}{10}$ = 6.4

B 2 10 $\frac{(2 - 10)^2}{10}$ = 6.4

Total Chi-square = 6.4 + 6.4 = 12.8

Degree of freedom = 2 - 1 = 1

Tabulated Chi-square (α = 0.05) = 3.8415

The calculated Chi-square exceeds the critical value, hence, it is significant and not due to random.

The correct option is c.

4 0

3 years ago

What does the number of electrons on the outer energy level of an atom tell you

adell [148]

Well, first off it tells you the number of valence electrons (because that’s what those are valence electrons) it also tells you how that atom is going to bond with other atoms (whether it will tend to loose or gain electrons when in chemical bonds). It also can show how reactive an element is (if it has eight or in some cases two then it won’t react because that outer shell is full)...basically it tells you the chemical properties of that atom

5 0

3 years ago

I need help on this question pls help

alexdok [17]

Answer:

50%

Explanation:

Tt and tt will produce the alleles:

Tt, tt, Tt and tt

T is dominant and is tall

Tt and Tt both have the allele T and are tall but tt and tt are not tall, so 2/4 will be tall

simplifying 2/4=1/2

1/2 × 100 = 50%

6 0

2 years ago

What body system are interacting in the first line of defense involving the skin

Digiron [165]

Answer:

Innate immune system

Hope this helps ❤️

4 0

3 years ago

Read 2 more answers