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2 years ago

How would the contractile vacuole of a freshwater amoeba respond if the organism was placed in seawater?

Biology

2 answers:

Elan Coil [88]2 years ago

6 0

Answer:

The answer is b

Explanation:

just took the test on edge 2020

adoni [48]2 years ago

5 0

Answer:

The answer is B

Explanation:

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M+ is an unknown metal cation with a +1 charge. A student dissolves the chloride of the unknown metal, MCl, in enough water to m

Simora [160]

Looks like you're missing an answer choice. I have this question on my practice test for AP Chemistry, the correct answer would be KCl.

mass AgCl = 2.23 - 0.80 = 1.43g AgCl

1.43g AgCl / 143g/mol AgCl = 0.01 moles AgCl

- AgCl has a mole ratio of 1:1 so:

moles Ag+ = moles Cl-, therefore Ag+ has 0.01 moles and Cl- has 0.01 moles

- MCl also has a 1:1 ration

moles Cl- = moles M+

- 0.01 moles of M+ and Cl-

0.01 Cl- = x/35.45 = 0.3545g Cl-

mass MCl = 0.74g

0.74g MCl - 0.3545g Cl- = 0.3955g M+

0.3955g M+/x =0.010 mol M+

x= 39.55g M+

K+ has a molar mass of approximately 39.10

Therefore KCl is your answer

6 0

2 years ago

Read 2 more answers

a sponge 1cm in diameter and 10 cm tall can move 22.5 L of water through its body each day. what volume of water will it pump th

Marat540 [252]

The part of the question about the size of the sponge is just there to trick you; you don't need it. All you need is the 22.5 L per day.

To find the amount of water it can pump in 1 hour, you divide the 22.5 by 24 because there are 24 hours in a day:

$(\frac{22.5L}{day})(\frac{day}{24hours})=0.9375\ liters\ per\ hour$

Now that we have hours, we can divide that by 60 to get the amount pumped per minute (because there are 60 minutes in an hour):

$(\frac{0.9375L}{hour})(\frac{hour}{60minutes})=0.015625\ liters\ per\ minute$

5 0

1 year ago

A farmer who grows blackberries has found his harvest to be lower than usual. He suspects that some animals are eating the berri

Morgarella [4.7K]

Answer:

The rows of bushes

Explanation:

The experimental unit in this experiment would be the rows of bushes in the field.

By definition, experimental units are considered physical entities that can randomly be assigned to varied treatment regimes during the course of a research.

In this case, the entity that are given different treatment condition during the process of experimentation are the rows of berry bushes within one of the several fields. Half of the rows were covered with nets while the remaining half were left uncovered.

The rows were given different treatments and hence, considered the experimental units in this particular experiment.

The correct option is c.

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1 year ago

a student placed a stack of rocks on a ramp. she added clumps of soil rooted with live grass. using a garden hose, she then appl

Arlecino [84]

Answer:b

Explanation:

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2 years ago

The energy source for sperm to swim comes from

Rama09 [41]

The energy source of the sperm for them to swim is the protein breakdown by mitochondria in the midpiece of the sperm.

Mitochondria are double membrane-bound organelles found in the cells. It is said to be the "powerhouse of the cell". They provide ATP as a source of chemical energy for the cells.

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1 year ago