Can you help me with this question please?

All of our planets and our Sun travel around the Milky Way

frutty [35]

Answer:

gravity.

Explanation:

gravity is the powerful force that glues our universe

together. gravity helped form our star system, the

planets, and the stars. it holds the planets in orbit

around the sun, and moons in orbit around the plants.

4 0

2 years ago

Materials chalk calcium hydroxide filter paper phenolphthalein heat source two Pyrex beakers Directions Crush some classroom cha

Sladkaya [172]

Phemolphthalein changes colour.(i forgot from which to which) This is because calcium hydrroxide is basic.

5 0

3 years ago

It has been estimated that 99% of the intestinal bacteria are A. facultative anaerobes.B. obligate aerobes.C. facultative aerobe

Klio2033 [76]

Answer:

Obligate anaerobes. (Ans. D)

Explanation:

Anaerobes: They are micro-organisms that do not require energy oxygen for metabolism. They can only survive in an environment that lacks oxygen.

Obligate anaerobes are bacteria typically living in various places naturally. Many of obligate anaerobes living in the human body, in places such as the mouth and gastrointestinal tract (most of the obligate anaerobes present their) where oxygen level present in very low concentration.

Obligate anaerobes do not contain several enzymes needed to detoxifying oxygen present in the cell. Oxygen produces several byproducts in the presence of water such as hydrogen peroxide, it is a week acid and affects no. of enzymes present in anaerobic cells. In a high level of oxygen anaerobic cells become more acidic and not able to function.

So that's why they are found in no oxygen or low oxygen environment like the gastrointestinal tract.

4 0

3 years ago

In an experiment designed to test the effect of temperature on goldfish respiration, the temperatures that were changed represen

DENIUS [597]

Answer:

C. experimental

Explanation:

Experimental variables are the variables that are changed during the experiments to observe the effects of these changes. An experiment usually has one or more experimental variables. An experimental variable that is changed to know its impact on some other variable is called the independent variable.

In the given experiment, goldfishes were exposed to various temperature conditions to observe the effect of temperature on respiration. Therefore, both temperature and respiration rate are the experimental variables here.

4 0

3 years ago

In nerve cells, the centrosome is located near the nucleus. Vesicles move from near the nucleus to the end of long extensions (a

lord [1]

Answer:

Plus end and kinesin.

Explanation:

Three important cytoskeleton components are microtubules, microfilaments and intermediate filaments. Microtubules are the polymer of tubulin and plays an important role in the movement of cell organelles and its structure.

Microtubules shows the process of polymerization and depolymerization at different ends. The plus end shows the polymerization and minus end shows the depolymerization process. The kinesin protein is required for the process of polymerization.

Thus, the correct answer is option (D).

7 0

3 years ago