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MrMuchimi
3 years ago
5

In his theory, Lamarck suggested that organisms will develop and pass on to offspring variations that they need in order to surv

ive in a particular environment. In a later theory, Darwin proposed that changing environmental conditions favor certain variations that promote the survival of organisms. Which statement is best illustrated by this information?(a) Scientific theories that have been changed are the only ones supported by scientists. (b) All scientific theories are subject to change and improvement. (c) Most scientific theories are the outcome of a single hypothesis. (d) Scientific theories are not subject to change.
Biology
1 answer:
Tomtit [17]3 years ago
8 0

Answer:

The correct answer would be (b) All scientific theories are subject to change and improvement.

Explanation:

No theory is considered the absolute truth, although some have been proved and deeply studied, through years many theories that were considered completely true, have become incomplete or false. Therefore, as true and correct a theory sounds, it can still be proved wrong in the future.

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This membrane mimics the __________________ that is around animal cells. In order to explore how water moves in and out of a cel
Olenka [21]

This membrane mimics the plasma membrane that is around animal cells. In order to explore how water moves in and out of a cell, one cell was weighed and then submerged in hypertonic solution. The other egg was weighted and submerged in hypotonic solution. It was predicted that the egg submerged in hypertonic solution  would decrease in mass. It was predicted that the egg submerged in hypotonic solution would increase in mass.

Explanation:

The outermost covering of an animal cell is the plasma membrane. It is a selectively permeable membrane that allows only selective molecules to pass through it.

A solution having higher concentration of solute than the cell cytoplasm is called a hypertonic solution.

A solution having lower concentration of solute than the cell cytoplasm is called the  hypotonic solution.

The movement of water molecules from the region of its higher concentration to the region of its lower concentration through a semipermeable membrane is called osmosis.

A cell placed in hypertonic solution will undergo exosmosis so it will lose water and its mass will decrease.

A cell placed in hypotonic solution  will undergo endosmosis of water  so it will gain water and its mass will increase.

8 0
3 years ago
Do centralean diatoms have symmetry
IgorLugansk [536]
They have bilateral symmetry and a rounded shape. 

8 0
3 years ago
Which are potential causes of dysthymia?
amm1812

Answer:

Damage to the heart muscle

6 0
3 years ago
Choose 5 different organisms. At least one of your organisms needs to be a plant. List an adaptation and describe how the adapta
spayn [35]

Answer:

1) wood frog - freezes their body in winter

To survive the winter Wood Frogs' bodies freeze solid. They also stop breathing and their heart stops beating. This allows them to survive temperatures as low as -80 degrees Fahrenheit. And in spring, they thaw out and "come back to life.

2) Kangaroo rats survive without ever drinking water.

Kangaroo rats have adapted to survive in the desert without ever taking a sip of water. Instead, they get all the moisture they need from the seeds that they eat. These critters also have incredible hearing and can jump up to nine feet, which helps them avoid predators.

3) Chameleon - blend in with the environment by changing its color to escape from predators

4)Okapi have scent-glands on their feet.

Okapi are strange animals that look like a combination of a giraffe and a zebra. They live in the Democratic Republic of Congo, where it's very hot and predators, such as leopards, are always lurking. To stay alive, okapi have a three key adaptations. First, they have scent-glands on their feet to mark their territory. Second, they have infrasonic calls, which allows them to communicate with their calves without predators hearing their call. Finally, they have 14-18 inch-long tongues, which can be used to wash their eyes and ears.

5)Venus fly trap plant that is adapted for living in soil that doesn't provide enough nutrients.

6)  the seaweed is a plant adapted for its underwater environment

6 0
2 years ago
What functions must a membrane allow?
andreev551 [17]

Answer:

They keep toxic substances out of the cell

Explanation:

They contain receptors and channels that allow specific molecules, such as ions, nutrients, wastes, and metabolic products, that mediate cellular and extracellular activities to pass between organelles

3 0
2 years ago
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