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jenyasd209 [6]
2 years ago
5

Planarians are free-living flatworms. Most species live in fresh water, but some species live in salt water. Some even live on l

and. These flatworms have the ability to replace lost body parts through a process called regeneration. Planarians are used to study regeneration and disease-causing worms.
Which statement describes freshwater planarians and their environment?

a) Without osmoregulation, planarian cells will shrivel.
b)The planarians live in a hypertonic environment.
c)The planarians’ internal solute concentration is equal to that of their environment.
d)The planarians need to avoid taking in too much water from their environment.
Biology
1 answer:
KiRa [710]2 years ago
6 0

The statement describes freshwater planarians and their environment is the d)The planarians need to avoid taking in too much water from their environment.

<h3>What is the Planaria environment?</h3>

It may be observed in lots of components of the arena in freshwater rivers, streams, or ponds. They live on the bottom of rocks, leaves, and different gadgets in shallow waters in addition to in aquatic plants which include Elodea and filamentous algae.

The planarian has a system of tubules extending all through its frame from the anterior to posterior on each sided of the frame. These tubules are known as protonephridia and that they gather each extra water and plenty of the nitrogen waste. The tubules have pores that lead out of the frame.

Read more about the planarians :

brainly.com/question/13632008

#SPJ1

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Make a list of the things that make a hurricane different from a regular thunderstorm.
Katarina [22]

Answer:

The biggest difference is that hurricanes need a warm moist water to keep on going and never forms over land, while thunderstorms can form over land or water. Tornadoes are also associated with cumulonimbus clouds.

Explanation:

A hurricane is a swirling, low-pressure system that develops over the tropics with sustained winds that have reached at least 74 miles per hour.

Warm, moist air near the ocean's surface rises upward, cools, and condenses, forming clouds. With less air than before at the surface, the pressure drops there. Because air tends to move from high to low pressure, moist air from surrounding areas flows inward toward the low-pressure spot, creating winds. This air is warmed by the ocean's heat and the heat released from condensation, so it rises. This starts a process of warm air rising and forming clouds and surrounding air swirling in to take its place. Before long, you have a system of clouds and winds that begins to rotate as a result of the Coriolis effect, a type of force that causes rotational or cyclonic weather systems.

Hurricanes are the most dangerous when there is a big storm surge, which is a wave of seawater that floods communities. Some surges can reach depths of 20 feet and sweep away homes, cars, and even people.

A thunderstorm is produced by a cumulonimbus cloud, or thunderhead, that includes rain showers, lightning, and thunder.

They start when the sun heats the earth's surface and warms the layer of air above it. This warmed air rises and transfers heat to the upper levels of the atmosphere. As the air travels upward, it cools and the water vapor contained within it condenses to form liquid cloud droplets. As air continually travels aloft in this way, the cloud grows upward in the atmosphere, eventually reaching altitudes where the temperature is below freezing. Some of the cloud droplets freeze into ice particles, while others remain "supercooled." When these collide, they pick up electric charges from one another; when enough of those collisions happen, the big buildup of charge discharges, creating lightning.

Thunderstorms are most hazardous when rain decreases visibility, hail falls, lightning strikes or tornadoes develop.

7 0
4 years ago
If A/A ⋅ B/B is crossed with a/a ⋅ b/b and the F1 is testcrossed, what percentage of the testcross progeny will be a/a ⋅ b/b if
Alex787 [66]

Answer:

a) 25%; b) 50%; c) 45%; d) 38%

Explanation:

<h3 /><h3>a) Unlinked genes</h3>

A/A B/B X a/a b/b

F1: A/a B/b

Testcross A/a B/b X a/a b/b

The homozygous recessive individual only produces <em>ab</em><em> </em>gametes.

The F1 produces four types of gametes (each of them with a frequency of 1/4):  <em>AB</em>, <em>Ab</em>, <em>aB </em>and <em>ab</em>.

25% of the progeny will be a/a b/b.

<h3>b) Completely linked genes</h3>

AB/AB X ab/ab

F1: AB/ab

Testcross AB/ab X ab/ab

The F1 produces only two types of gametes, the parentals (each of them with a frequency of 1/2):  <em>AB</em> and <em>ab</em>.

50% of the progeny will be ab/ab.

<h3>c) 10 m.u. apart</h3>

AB/AB X ab/ab

F1: AB/ab

Testcross AB/ab X ab/ab

The F1 produces four types of gametes, the parentals <em>AB</em> and <em>ab </em>and the recombinants <em>Ab</em> and <em>aB</em>.

Since the genes are 10mu apart, 10% of the produced gametes will be recombinant and 90% will be parentals. Since there are two types of parental gametes, each of them has a frequency of 45%.

45% of the progeny will be ab/ab.

<h3>d) 24 m.u. apart</h3>

This is very similar to c).

Since the genes are 24mu apart, 24% of the produced gametes will be recombinant and 76% will be parentals. Since there are two types of parental gametes, each of them has a frequency of 38%.

38% of the progeny will be ab/ab.

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Which describes a grizzly bear’s habitat?
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What are used to infer genotypes from the observation of phenotypes?
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Answer:

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In which of the following processes does water become water vapor?
olga_2 [115]

Answer:

evaporative cooling

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