4. Choose the best explanation of the difference between evolution and natural selection.O A. Evolution is the idea that species change over time, and natural selection is the idea that nature cha
O B. Natural selection is the idea that species change over time, and evolution is the idea that our world c
O C. Natural selection is the idea that species change over time, and evolution is the idea that the species
O D. Evolution is the idea that snecies change nyer time and natural colo


Answer 1


A. Evolution is the idea that species change over time, and natural selection is the idea that nature cha

Related Questions

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The spiral ganglion cells of the inner ear are unipolar.
a. True
b. False



b. False


The spiral ganglion, formed from the primitive otocyst, is located on the cochlea's modulus (axis) and is made up of approximately 35,000 neurons in man. These bipolar neurons are of two types: type I and type II. Its peripheral extensions (dendrites) end in the spiral organ, in contact with the hair cells of which they receive information. Its central extension (axon) ends at the cochlear nuclei of the brainstem.

Through which process do producers make food




if work,mark brainilest-_-

Answer:Producers make food for the rest of the ecosystem through the process of photosynthesis, where the energy of the sun is used to convert carbon dioxide and water into glucose

The secretion of hormones by the pituitary gland is an example of _______________.autocrine signaling
paracrine signaling
endocrine signaling
direct signaling across gap junctions



The correct answer is the third option - endocrine signaling.


The endocrine signaling takes place when endocrine cell organs or glands release hormones that flow through the bloodstream and that act on distantly located target cells in the body. The endocrine system includes several glands that release or secretes different hormones.

The pituitary gland transfers signals to other endocrine glands to release or inhibit their hormone production according to the brain signals. The adrenocorticotropic hormone (ACTH) is released by the anterior pituitary gland that stimulates cortisol release in the adrenal glands in stressed conditions.

Thus, the correct answer is option third - endocrine signaling.

Final answer:

The pituitary gland secreting hormones is an example of endocrine signaling, where hormones are secreted directly into the bloodstream and carried to target cells.


The secretion of hormones by the pituitary gland is an example of endocrine signaling. Endocrine signaling refers to the process where glands secrete hormones directly into the bloodstream, which are then carried to the target cells elsewhere in the body. In contrast, autocrine signaling involves cells responding to their own signals, paracrine signaling refers to cells communicating with nearby cells, and direct signaling across gap junctions involves communication between adjacent cells through specific channels.

Learn more about Endocrine Signaling here:



(30 points) {Brainliest} help me plz <3An experimental pharmaceutical is typically approved after it passes which phase of clinical trials?

A. 4
B. 2
C. 3
D. 1


An experimental pharmaceutical is typically approved after it passes 4 phase of clinical trials.

What is clinical trial ?

Clinical trials are combination of new research, studies and experiments performed in people to evaluate the effectiveness of new experiment on human health.

It consists of main 4 phases.

Phase 4 clinical trial is also known as " Post-Approval Research and Monitoring ". It is the final stage of trial for any pharmaceutical product, drug or device. This trial study about the side effects, real life scenarios, long-term risks and benefits of particular pharmaceutical product which were not seen in the early trials.

So we can sayan experimental pharmaceutical can be approved when it passes 4 phases of clinical trials.

To know more about phases of clinical trial please click here : brainly.com/question/3429518?utm_source=android&utm_medium=share&utm_campaign=question


Actin, myosin, and troponin are:A) ligaments
B) tendons
C) muscle protein
D) bones
E) types of ligaments

The connective tissue holding bone to bone is a;
A) tendon
B) muscle
C) smooth muscle
D) ligament
E) A and D



1. C: muscle protein

2. D: ligament

1. Actin and myosin are proteins that form contractile filaments of muscle cells.  Troponin regulates muscular contraction and is found in skeletal and cardiac muscle fibers.

2. Tendons connect muscle to bone.  Muscles provide movement.  Smooth muscles behave involuntarily.  Ligaments connect bone to bone.

Dams are barriers that prevent the flow of water. They are created to provide flood control, recreational areas, water for irrigation, and hydroelectric power.Although dams serve many important purposes, they can also have a negative impact on the environment by
preventing fish from moving along a river.
serving as a place for people to have picnics.
increasing fresh water sources for humans.
providing new wildlife habitats.



A. Preventing fish from moving along a river.


1. Dams create barriers and trap the water that builds up behind it. This prevents fish from moving along the river as there's a barrier in place and is just overall harder for the fish to move freely along a river because of it.

2. It's the only negative option as the others are all positive outcomes, while the question asks for a negative outcome instead.

Hope this helps!