List at least four reasons why it is difficult to send manned space flights to parts
of the solar system other than the moon.

Answers

Answer 1
1 you run out of fuel 2 it takes a long time 3 it’s hard to get back 4 the conditions are constantly changing making it harder to predict what could happen. Look at Apollo 12 as a example

Related Questions

What is the relationship between photosynthesis and respiration with respect to energy

Answers

“Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.”

Answer:

Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is food for the plant.  Cellular respiration converts oxygen and glucose into water and carbon dioxide. ATP is the energy that is made in the process.

Explanation:

Why is it important for a cell to be able to turn a gene off?

Answers

Answer:

Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell, for example. Gene regulation also allows cells to react quickly to changes in their environments.

Identify which of the following will easily pass through the membrane? A.) Protein Hormone B.) Steroid Hormone C.) Charged Ion D.) Water

Answers

Answer:

Hope this helps a bit, sorry if it doesn't. Have a good day/night! :}

Explanation:

Steroid Hormone: It is thought that, because of their lipophilic nature, free steroid hormones enter target cells primarily by passive diffusion through the cell membrane. After gaining entry to the cell, steroid hormones act as ligands for nuclear receptors and alter gene transcription

Protein Hormone: Small uncharged molecules can diffuse freely through a phospholipid bilayer. However, the bilayer is impermeable to larger polar molecules (such as glucose and amino acids) and to ions. These molecules pass across membranes via the action of specific transmembrane proteins, which act as transporters.

Water/Ion: Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.

A substance that will easily pass through the membrane is: B. steroid hormone.

What is a membrane?

A membrane can be defined as the thin layer that separates the ineterior of a living cell from another, especially by forming its outer boundary or layers.

This ultimaetly implies that, a membrane provides protection for a living cell or an internal cell compartment from its environment.

In conclusion, a steroid hormone is a substance that will easily pass through the membrane.

Read more on membrane here: https://brainly.com/question/734740

1.
The cell membrane is a permeable membrane found around the perimeter of the cell. It
takes in [ ], expels [] and provides [] for the cell, which are life functions of all cells.

Answers

Answer:

Nutrients, wastes and structure ( shape)

Explanation:

What was the first animal on the endangered species list?
bald eagle
humpback whale
Great white shark
Saber tooth tiger

Answers

Answer:

Bald Eagle is correct answer

plz mark me brainliest

Answer: Bald Eagle

Explanation: The bald eagle was the first animal on the endangered species list.

How will distinguish between natural and artificial fibres by observing the smell produced when burnt?​

its not biology it's chemistry

Answers

Answer:

Natural fiber smell like paper whereas artificial fiber smells like an acid.

Explanation:

We can distinguish between natural and artificial fibers by observing the smell produced when burnt because both produces different types of smell when burnt. When the artificial fibers are burn, it produces acid or chemical like odor and leaving a plastic like bead while on the other hand, when the natural fiber burn, it produces smell of burning paper or hair and leaving ash of soft and grey colour. Natural organic fibers burn rapidly with a yellow flame.

¿Qué estructuras y organelas son exclusivas de las células eucariotas vegetales?, ¿cuáles son las funciones de cada una?

Answers

Answer:

Las estructuras y organelas que son exclusivas de las células eucariotas vegetales son: la pared celular, los cloroplastos, las vacuolas y los plastidios. Cada una de estas estructuras tiene distintas funciones.

Explanation:  

Las células eucariotas vegetales tienen otro tipo de estructuras y organelas ya que tienen otro tipo de procesos, entre los cuales se encuentra la fotosíntesis.

Funciones:

Pared Celular: protege la membrana plasmática y toda la estructura celular. Tiene plasmodesmos a través de los cuales ingresan sustancias.

Vacuolas: almacenan sales, agua y productos residuales

Plastidios: le dan distintas características a las plantas. Algunos almacenan sustancias, otros definen su color.

Cloroplastos: son un tipo de plastidios y tienen un pigmento llamado clorofila.

which property of water molecules explains the other properties listed below

A. Adhesion
B.Cohesion
C.Hydrogen Bonds
D. Polar Covalent bond

Answers

Explanation:

A. Adhesion

plzzzz mark me brainliest if it helps you then

The property of water that explains the other properties listed below is hydrogen bonds.

WATER MOLECULES:Water is a unique molecule with unique properties that distinguishes it.

Water is made up of two atoms of hydrogen and one atom of oxygen joined together by covalent bonds.

Each water molecule is joined to one another by hydrogen bonds. These hydrogen bonds is responsible for the unique properties exhibited by water including adhesion & cohesion, solubility etc.

Therefore, the property of water that explains the other properties listed below is hydrogen bonds.

Learn more about hydrogen bonds at: https://brainly.com/question/4542860

If a body cell in an organism had 80 chromosomes, how many chromosomes would a sperm cell or egg cell have in the same organism?
A.40
B.80
C.160
D.20

Answers

ANSWER 40

Humans have 23 pairs of chromosomes i in each pair is from the dad and the other is from the mom.With this information we can know that the answer is 80 chromosomes 40 from each parent

what was one problem the printing press fixed

Answers

It reduced time to copy texts and books

When this organism is dead, it is eaten by worms whose waste recycles energy back into the
soil. This organism only consumes other organisms that make their own chemical energy by
using solar energy.
What type of organism is being described?

Answers

Answer:

Decomposers

Explanation:

They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers.

Decomposers

Decomposers play a critical role in the flow of energy through an ecosystem. They break apart dead organisms into simpler inorganic materials, making nutrients available to primary producers.

We breathe in_____
spores all the time. The air is loaded with them.

Answers

Answer:

water spores

Explanation:

cheese

Answer:

Microorganisms

Explanation:

Prokaryotic cells —
A. Contain membrane bound organelles
B. Contain large numbers of chromosomes
C. Lack true nuclei
D. Lack ribosomes

Answers

Answer:I believe the answer is c

Explanation:

Answer:

I'm pretty sure your answer is C. Lack true nulei

Explanation:

Competition for natural resources has often caused
among humans.

Answers

Answer:

yes what is your question

Describe how people change their body shapes (not their clothes) when they are very hot and when they are very cold. Use your knowledge of surface area : volume ratios to explain why we do this.

Answers

Answer:

This quesiton is unclear

Explanation:

The body has negtive feedback loops that either vasoconstrict (preserving heat by lessening the surface area of blood vessels so they are exposed to less cold and release less heat) and vasodilation, where blood vessels are expanded and have higher surface areas so the body hopes to lose more heat to cool down.

If this is purely body language (like going into a fetal position when its cold: to lessen the surface area exposed to the cold temperature and lose less heat, imagine an ice cube vs. a long thin tube of ice with equal volume, the cube will last longer. Similarly our bodies would spread out to release more heat (unless there was sun) this is to expose the most surface area, allowing our body to release the most heat. Note: this is pretty insignificant change, and in extreme temperatures will likely not help, but it does contribute.

When the cell increases in size, the volume increases faster than the surface area, because volume is cubed where surface area is squared. When there is more volume and less surface area, diffusion takes longer and is less effective.

what will happen if we don't protect birds

Answers

Answer:

Humans would lose a large part of their diet. Insects would would increase a lot. We would lose all products produced from bird parts.

Explanation:

Can you PLEAZE answer these fast


Answers

Answer:

It’s blurry

Explanation:

Answer:

Number 1 Blank Is "Virus"

Number 2 Blank Is "Vaccine"

Number 3 Blank Is "Flu"

Number 4 Blank Is "Pandemic"

Number 5 Blank Is "Severe"

name the five kingdoms?​

Answers

Explanation:

animal, plant, fungi, protist and moner

Explanation:

Living things are divided into five kingdoms: animal, plant, fungi, protist and monera.

The structure of proteins is related to their function. true or false

Answers

Answer:

A protein's shape determines its function. Proteins are composed of amino acid subunits that form polypeptide chains.

it's true

What process does a multi-cellular organism use to replace its damaged body cells

Answers

Answer: mitosis.

Explanation:

The process is called mitosis.

In the case of a tick feeding off a deer, the deer would be considered _____ and the tick would be considered _________.

Answers

Answer:

The tick would be considered a parasitism and the dear would be considered a prey

Explanation:

i Hope this helps

An underground water supply has a depth of 200 m of water. Water seeps in at the rate of 4 cm / year . Water is pumped out at the rate of 1m / year . How long will this water supply last? To find the net water loss from an underground water supply, subtract the amount that seeps into the water sup ply from the amount removed from the water supply. How long will the water supply last if water seeps in at the rate of 10 cm / year and is removed at the rate of 10 cm / year ?

Answers

Answer:

208 years.

Explanation:

The water supply last for 208 years if the water seeps in at the rate of 4 cm / year  and water is pumped out at the rate of 1m / year. The water supply last forever if water seeps in at the rate of 10 cm / year and is removed at the rate of 10 cm / year because the same amount of water enters the underground which can be pumped from the soil. If more water is extracted from the soil as compared to it seeps, so with the passage of time water concentration in the soil decreases and in the last it disappeared.

How might the ATP produced in a muscle cell be impacted by a worldwide drought.

Answers

With each contraction cycle, actin moves relative to myosin. ... ATP can then attach to myosin, which allows the cross-bridge cycle to start again; further muscle contraction can occur. Therefore, without ATP, muscles would remain in their contracted state, rather than their relaxed state.

Which of the following best describes Growing Degree Day total?


A. a measure of the amount of heat needed to encourage plant growth

B. a measure of the amount of heat a plant is exposed to over a single day

C. a measure of the amount of heat a plant must experience before reaching maturity

D. a measure of the amount of heat tolerance a plant demonstrates

Answers

Answer:

C.a measure of the amount of heat a plant must experience before reaching maturity

I learned this two days ago and I believe the answer is C

process of how a seed grows into a plant​

Answers

Answer: As it takes up more water, the seed expands and the seed coat cracks open. The embryo inside the seed is made up of a small shoot and a small root. The root is the first to emerge from the seed. As it grows, it anchors the plant to the ground, and begins absorbing water through the root.

Explanation: Hope this helped !!!

HELP! The drawings below represent four different forms of energy. Which
diagram represents the greatest amplitude?

Answers

Answer:

d

Explanation:

Answer:

b hope this helps

Explanation:

imagine that a small snake in a grassy yard sees you coming. which type of motion would it probably use to move away quickly? Why?

Answers

I'm not good at science sorryyyyy but it could be thrust as it's pushing itself away???

What would happen if the American bullfrog went extinct? NO LINKS!!!!!!!!!!!!!!!!!!

Answers

Answer: The death of frogs would send a ripple through the ecosystem. The number of animals that eat the frogs will die off, then the animals that eat them will go hungry, and their populations will be devastated as well. This would just keep going up the food chain

Explanation:

Invasive bullfrogs upset the balance of predator-prey interactions and competition for food and shelter, but they also may be worsening another ecological disaster in the amphibian world. ... The invasive American Bullfrog can act as a vector, harboring this fungus, with no ill effects, and spread it to other amphibians

hopefully this helps :)

When alleles increase in frequency because they allow the organism to
better survive and reproduce in its environment, this is a result of:
1. Natural selection
2. mutation
3. adaptation
4. gene flow

Answers

Mutation because I did this for homework before and got it right so

Answer: 1. Natural selection

Explanation:

The picture is Groove in a cliff

Answers

I think it might be 4
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