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3 years ago

2.

Biology

1 answer:

GenaCL600 [577]3 years ago

3 0

Answer:

Explanation:

morphology is the study of living organisms and the relationship between their body structures.

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Name the five cardiac cycle activities starting with excitation and ending with regulation of blood flow and volume.

stira [4]

Answer:

Explanation:

1) Excitation brings about contraction.

2) Contraction leads to an increase in blood pressure.

3) Changes in blood pressure results in the opening and closing of the heart valves.

4) The opening and closing of heart valves then regulates the flow of blood and it's volume.

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4 years ago

The urethra carries urine outside of the body, and the corpus cavernosum carries sperm outside of the body. true false

Elina [12.6K]

Answer: False

Explanation:

The urethra is a tube which runs from the bladder to the end of the penis. It functions by carrying the urine and semen outside the male body.

Urethra is made of two components. Prostatic urethera is the part that runs from the bladder through the prostrate.

The penis is only organ which carries both the fluids out of the body.

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3 years ago

How are fossils different from animals living today?

postnew [5]

Answer: fossils are remains of dead or extinct animals/plants

8 0

3 years ago

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What changes can be made to improve biodiversity?

Dmitriy789 [7]

Conservation and by recyclig we can improve biodiversity

5 0

4 years ago

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When a living organism dies, it stops taking in new carbon. Thus, as the radioactive carbon-14 decays, the ratio of carbon-12 to

Alexxandr [17]

Answer: The fossil is 11459 years old.

Explanation:

Half-life of carbon-14 = 5700 years

First we have to calculate the rate constant, we use the formula :

$k=\frac{0.693}{5700\text{years}}$

$k=1.21\times 10^{-4}\text{years}^{-1}$

Now we have to calculate the age of the sample:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $1.21\times 10^{-4}\text{years}^{-1}
t = age of sample = ?
a = let initial amount of the reactant = 100 g
x = amount decayed = 75 g
a - x = amount left after decay process = 100 - 75 = 25 g Now put all the given values in above equation, we get
[tex]t==\frac{2.303}{1.21\times 10^{-4}}\log\frac{100}{25}$

$t=11459years$

The fossil is 11459 years old.

4 0

3 years ago