People and animals breathe in oxygen from the air and exhale carbon dioxide.What happens to the carbon dioxide in the air?

A. Some animals breathe in carbon dioxide and exhale oxygen.

B. The carbon dioxide floats into the atmosphere and forms clouds.

C. Plants use carbon dioxide to make sugars and oxygen.

Answers

Answer 1

Answer: plants such as trees convert co2 into o2

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Two objects are 5 kg and 10 kg respectively, and they're 10 m apart. If the distance between them is increased to 20 m, what happens to the gravitational force?A. It decreases.B. It increases slightly.C. It is doubled.D. It doesn't change

Answers

Answer: OptionA it decreases

Explanation :

The formula for gravitational force F is given by

F = G M1*M2/ $d^(2)$

where, G is the gravitational constant

M1 and M2 is the mass of the two bodies.

d is the distnce between the two bodies.

Now according to the question,

M1 = 5 kg

M2= 10 kg

d = 10

If we put these values in the formula we get,

F = 6.67 * $10^(-11)$ * 5 *10 / $10^(2)$

F = 3.335 * $10^(-11)$

Now, if the d= 20

then the answer comes out to be 0.83375* $10^(-11)$

Thus, we can see that the gravitational force decreases.

We can also find the answer without any calculation from the fact that in the formula the force is inversely proportional to square of distance, thus as the distance increases, the gravitational force decreases.

i think B. It increases slightly.

Which pairings match protozoa with the structures they use to move? amoeba: flagellum; euglena: cilia; paramecium: pseudopod amoeba: pseudopod; euglena: flagellum; paramecium: cilia amoeba: flagellum; euglena: pseudopod; paramecium: cilia amoeba: pseudopod; euglena: cilia; paramecium: flagellum

Answers

Answer:

The correct answer is - amoeba: pseudopod; euglena: flagellum; paramecium: cilia

Explanation:

Protists use different type of structures for their movement known as pseudopods, flagella, and cillia.

Pseudopods are the structures found in amoeba in which flowing of protoplasm moves the amoeba forward.

A euglena moves by strikes or whip its flagellum, that is a long appendages, like propeller of a helicopter.

Cilia are thin, very small tail-like structure that stretched outward from the of body of paramecium.

Thus, the correct answer is - amoeba: pseudopod; euglena: flagellum; paramecium: cilia

Alchemy was practiced: -in the Middle Ages -by modern chemists -by Renaissance scientists

Answers

Alchemy was practiced in the middle ages, during the medieval period, around 1200-1300 AD

It was practiced in the Middle Ages

Which statement regarding the June solstice is true?The Southern Hemisphere is tilted toward the sun.
The Northern Hemisphere is tilted toward the sun.
Locations in the Northern Hemisphere experience 12 hours of daylight and 12 hours of darkness.
Locations in the Southern Hemisphere experience long days and short nights