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Romashka [77]
3 years ago
7

SERIOUSLY I NEED HELP I AM TAKING A QUIZ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Biology
2 answers:
Setler [38]3 years ago
8 0

c is the correct answer

dem82 [27]3 years ago
3 0

Answer:

cardiac

Explanation:

An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions.

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Biology help please i will upvote
jok3333 [9.3K]
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7 0
3 years ago
How can a scientist test a hypothesis if it is not possible to do a controlled experiment.
serious [3.7K]

Answer:

In an experiment, the researcher needs to have a control group with an experimental group where both groups are identical in every way except that the controlled group does not gets the experimental treatment.

Sometimes, it is not possible to do a test or the experiment utilizing a controlled trial (due to ethical reasons or no practical method available). All things considered, a researcher may test a theory by making predictions about outcomes or patterns that ought to be found in nature if the hypothesis is right.

3 0
3 years ago
The human genome consist of about ____ chemical letters
Olegator [25]

I believe that it consists of about 3 billion letters/base pairs

5 0
3 years ago
Read 2 more answers
how do the hypothalamus and pituitary gland interact to control the release of the some of the hormones in the endocrine system
blagie [28]

Answer:

Your hypothalamus communicates with the anterior pituitary lobe via hormones and the posterior lobe through nerve impulses. Through the stalk.

8 0
1 year ago
Why is it incorrect to say the insulation 'keeps out the cold'
Sonja [21]
Because technically there is no such thing as cold
all that exists is heat
this is because heat is the rapid movement of particles, made by friction (to understand why you must delve into physics and some chemistry)
so, when you feel cold, it's really the absence of heat
so instead of "keeping the cold out", which makes no sense at all scientifically, insulation keeps the heat in.

as a side note
the feeling of cold is produced when you come in contact with an object (yes, air counts) that has less heat, or energy, than you do, You feel cold because heat (energy) from your body is being transferred to the environment. This ABSENCE OF HEAT in your body is why you feel cold
4 0
3 years ago
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