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Nastasia [14]
3 years ago
8

He cell membrane forms a protective barrier between the external and internal environments. It is referred to as _______________

____, because it allows some substances to cross more easily than others and blocks other substances from crossing into the cell.
Biology
2 answers:
Ray Of Light [21]3 years ago
8 0

Answer:

Selectively permeable

Explanation:

Vsevolod [243]3 years ago
5 0
It is referred to as a selective semipermeable membrane because it only allows certain things through, due to the size and shape of whatever is trying to get through.
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Learning that occurs when an organism makes a connection between two events is called _____.
antiseptic1488 [7]

Learning that occurs when an organism makes a connection between two events is called "Associative learning".<span>
The process involves associating various details or events to learn a particular fact or information. For example one cannot imagine one eye of his/her father, whenever he/she will imagine the whole face of their father will make sense to mind and not single eye.</span>

4 0
2 years ago
What element is necessary for the production of thyroid hormone?
liubo4ka [24]

Answer:

Iodine

Explanation:

This is a trace element needed for the  synthesis of the two thyroid hormone ; T4- thyroxine and T3-triiodothyronine. Four iodine molecules are added in T4 synthesis, and  three for T3 synthesis. Generally T4 is the major hormone produced, but  biologically transformed into active form T3.

Iodine majorly and selenium are the two trace elements needed for thyroid hormones synthesis. Therefore required amount of iodine is important in daily diet. iIn adequate supply of this leads to under production of iodine called hypothyroidism. poor brain development ( especially in kids),and goiter.

Sea foods . eggs, poultry seaweeds are rich sources of iodine.

Conversely, when  excessive amount is present in the blood, autoimmune thyroid diseases can occur,including cancer developments in the thyroid gland due to hyper cell activities.

8 0
3 years ago
PLEASE DON'T LEAVE UNHELPFUL ANSWERS
Readme [11.4K]
<span>1. One common interaction between biotic and abiotic components of an ecosystem is photosynthesis. Sunlight is abiotic (solely energy), and it fuels the synthesis of sugars and proteins inside plant cells once it is taken up by plant leaves. </span><span>This process also produces oxygen.


</span>
2. Biotic factor that can affect the size of a population in a specific ecosystem:
<span>Number and kinds of predators in the ecosystem.
</span><span /><span>
Predator-prey relationships
When the moose population is high on Isle Royale, the wolves have more food source from preying on the moose. This supports an increase in the wolf population.</span>
<span /><span>
3. Temperature
You can change the temperature to freezing it will affect the aquarium because the organisms will not be able to tolerate the new environment if they are species that thrive in warm temperatures.
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4 0
2 years ago
7. Use the following formula to calculate the kinetic energy of a boy with a mass of 100 kg running at a speed of 2 m/s.
Ludmilka [50]

Answer:

perharps 200

Explanation:

well since the formula is mass times speed

then it will be 100*2

which is 200

hope this helped in some way

7 0
2 years ago
which of the following is a true statement about prokaryotic organisms? a. they reproduce sexually. b. they reproduce in a way s
iren [92.7K]
D. they reproduce by binary fission, is the answer I think
5 0
3 years ago
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