(it’s a multi choice question please helpppp) Which of the following is a reason scientists use models?

Which statement is best supported by the data on the map?
A. All countries have beryllium deposits, but some have more
deposits than others.
B. Some countries have many sources of beryllium, and some have
no sources of beryllium.
C. All the beryllium used in the United States must come from other
countries.
D. Only people in countries that have beryllium deposits are able to
have cell phones.

Which is a property of ultraviolet C (UVC)?
a. has the longest wavelength
b. is the least reactive
c. is the least absorbed by the stratosphere
d. is the most reflected by Earth's surface
e has the most energy

Biological diversity, or biodiversity, has become a topic of great concern among conservationists. Biodiversity is often used by scientists and policy makers to help determine the health of ecosystems. (a) Describe TWO characteristics shared by ecosystems that have high biodiversity. (b) Identify TWO specific human activities that result in a loss of biodiversity, and explain how each activity lowers biodiversity. (c) For each human activity you discussed in (b), propose a practical strategy (other than simply banning the activity) to reduce the loss of biodiversity. (d) Describe ONE naturally occurring factor that could lead to a loss of biodiversity. (e) Describe TWO ecological benefits that greater biodiversity provides.

Question 13: I need help please

The diagram shows the movement of water through a
plant.
Whích two terms or phrases describe the process shown?
A. Limp guard cells
B. Open stomata
O C. Transpiration
O D. Low turgor pressure

Use scientific language to describe two ways that embryos and fossils are different.

Describe what you believe a chemical rxn is ? Use the lab to describe it in 3 or more sentences.

How does the cell membrane contribute to the ability of a cell to exists in a changing
environment and still maintain homeostasis?

It is widely accepted that living organisms are made of cells. This belief is confirmed by many years of scientific observation that has been supported by large amounts of data. Which of the following statements is included in the modern Cell Theory? *

I and II

II and IV

I and III

I and IV

All of the following are threats to biodiversity EXCEPT
a. habitat destruction.
b. gene pool diversity.
C. pollution.
d. exotic species.

Which type of process occurred in the ecosystem that was affected by the 1988 fires in Yellowstone Park, which destroyed most of the vegetation but left the soil intact?

what is a cell mention any one function of it​

What would happen to the bison population if a
drought caused many of the grasses in the prairie
ecosystem to die?
O A. The bison population would decrease
quickly
O B. The bison population would not change in
response to a change in the amount of
grasses.
C. The bison population would increase
quickly.
D. There is not enough information to form a
hypothesis about a change in the bison
population in response to a change in the
amount of grasses.

if you have 6% guanine how much of the other bases do you have? please hurry

What color face do you think the cloned sheep will have?

Which of the following is a SLOW process that changes Earths surface?
A. Flooding
B. Earthquake
C. Wind erosion
D. Volcanic eruption

SOMEONE HELP!!!!!!!test due in 30 min i need help answer as many as you can and put the number next to the one you answer !!!!!!!PLEASE!!!!!!!!!

Which of the following items have the WEAKEST gravitational force?
(3 Points)

A pencil and a book that are 10 cm apart

A pencil and a book that are 20 cm apart

A bowling ball and a book that are 10 cm apart

A bowling ball and a book that are 20 cm apart
2 In this system which way does the electricity flow?
(5 Points)

From the battery to the light bulb.

From the negative end of the battery to the positive end of the battery.

From the lightbulb to the battery.

From the positive end of the battery to the negative end of the battery.
319. An electric current produces a(an)
(4 Points)

magnetic field.

conductor.

solenoid.

insulator.
4You make your bed with the warm sheets you just pulled out of the dryer. Once you turn your light off and get into bed you notice tiny sparks in your sheets when climbing into bed. What could be causing this?
(4 Points)

When your sheets were in the dryer, they became charged with static electricity due to friction and now they are discharging causing the sparks.

The sheets are giving off electrons because you are positively charged.

When your sheets were in the dryer they became neutrally charged due to conduction.

D. The sheets got very warm in the dryer and now are sparking due to the heat they conducted.
5Which sets of magnets(s) below are attracted to each other?
(4 Points)


Y and Z

Only Y

X and Z

Only Z
6A temporary magnet _______________________
(4 Points)

keeps its magnetism for a long time.

easily loses its magnetism.

cannot be destroyed.

has two north poles.
7The diagram shows the magnetic field lines between two magnetic poles, A and B. Which statement correctly describes the polarity of magnetic poles A and B?
(5 Points)


A is a north and B is a south pole

A is a south pole and B is a north pole

Both A and B are north poles

Both A and B are south poles
8Which pair of magnets is arranged so that opposite poles are placed near each other?
(3 Points)

only B

only C

both B & C

You cannot tell from the picture.
9Which of the following are examples of static electricity?
(2 Points)

Lightning

Laundry sticking together coming out of the dryer

Shocking your finger on the doorknob

All of these
10Which of the following descriptions describe objects that are good conductors of heat and electricity?
I. metallic
II. allows heat and electricity to flow easily through it
III. repels a magnet
IV. does NOT allow electricity to flow through
V. particles are evenly distributed through the object
VI. restricts the flow of heat and electricity
VII. particles are unevenly distributed
(4 Points)

III, IV, VI, & VII

I, II, & V

none of these describe conductors

I, II, V, & VII
11A generator transforms __________________________________
(4 Points)

potential energy into kinetic energy.

magnetic energy into electrical energy.

mechanical energy into electrical energy.

friction into electrical energy.
12Which of the following descriptions are benefits of using an electromagnet instead of a permanent magnet are:
I. their strength can vary
II. they can be turned on and off
III. they work on metallic and non metallic objects
(5 Points)

I only

II only

III only

I & II

I & III

all of them

Discuss 2 pros and 2 cons of selective breeding associated with different factors (social,
economic, environmental, ethical)

How does an inhaler work?

Please help me with these science questions about ecology!

Circle the letter of the choice that best completes the statement or answers the question.
11. Energy that is lost at each trophic level of an ecosystern is replenished by
a. heat.
b. nutrients.
sunlight
c. sunlight
d. organisms.
12. Besides energy, what moves through the organisms at each trophic level of an ecosystem?
a. organisms
b. nutrients
c sunlight
d. cycles
13. Evaporation and condensation a part of the
a. carbon cycle.
b. nitrogen cycle.
c phosphorus cycle.
d. water cycle.
14. Plants lose water to the air through
a. condensation
b. photosynthesis.
c. Their roots.
d. evaporation
15. Animals lose water when they
a. breathe in
b. urinate.
c breathe out
d. both b and c.
16. The major process by which water in the atmosphere is returned to the earth is
a. precipitation
b. evaporation
c. photosynthesis.
d. decomposition.
17. Autotrophs and heterotrophs use carbon-containing molecules for energy and for
a photosynthesis.
b. growth.
c decomposition
d. both a and b.
18. What do plants use in photosynthesis to make carbon-containing molecules?
a carbon dioxide
b. carbohydrates
c. fertilizer
d. oxygen
19. Heterotrophs get carbon-containing molecules by
a. making the molecules themselves.
b. feeding on other organisms.
c decaying.
d. growing.
20. When decomposers break down the carbon-containing molecules in dead organisms,
a. the dead organisms are converted to coal.
b. oxygen is released.
c carbon dioxide is released.
d. carbon dioxide is converted to energy-rich
carbon-containing molecules.

In rabbits, black fur (B) is dominant to brown fur (b). Consider the following cross between two rabbits.
Bb x Bb
B
b
B
1
2
b
3
4
Refer to the illustration above. The device shown, which is used to determine the probable outcome of genetic crosses, is called a

What does corn, dogs, and genes have in common.

identical cells are produced at the end of mitosis

Explain the role of adrenaline in the formation of emotional memories.

10. Mara's dad breeds chameleons of different colors. The bright green
chameleons are the best sellers. Therefore, he purposefully breeds the bright
green ones together to reproduce as many as possible. This is an example of what
selection.
-Natural
-Artificial
-Coincidental
-Genetic Modification

How do fungi play roles in the death and the life that happens in a
forest?

Why are phytoplankton important in the carbon cycle?

¿cual es la impoortancia de la fotosintesis para la vida en la tierra?

DNA is coiled into___.Proteins called____and help to keep the DNA___.​

Mistletoe contains root-like structures that penetrate the branches of oak trees, where they absorb water and minerals from the oak tree. This is an example of --
A- predation
B- competition
C- parasitism
D- commensalism