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stiks02 [169]
3 years ago
6

Did birds evolve from the gliding reptiles called pterosaurs?

Biology
2 answers:
Law Incorporation [45]3 years ago
5 0
Yes, the pterosaurs is the ancestor of the bird. 
kenny6666 [7]3 years ago
3 0

No. Birds are direct ancestors of dinosaurs, having simular trates such as wish bones, hollow bones, and feathers. All pterosaurs went extinct in the k.t. mass extinction. Not to mention pterosaurs flew with the skin connecting their wings to their body, as birds flew with primary flight feathers.

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What is a natural, nonspecific immune response, but it is part of the body's second line of defense?
Strike441 [17]

The adaptive immune response is the second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.

<h3>What is second line of defense?</h3>

Nonspecific resistance, which destroys invaders without targeting specific individuals, is the second line of defense: phagocytic cells ingest and destroy all microbes that enter body tissues.

The adaptive immune response is the body's second line of defense against non-self pathogens. Adaptive immunity, also known as acquired immunity or specific immunity, is found only in vertebrates.

Thus, adaptive immune system is a natural, nonspecific immune response, but it is part of the body's second line of defense.

For more details regarding second-line defense, visit:

brainly.com/question/15026334

#SPJ1

8 0
2 years ago
Which of the following are types of small-scale mutations?<br> Put the things in order plz.
Korvikt [17]

Answer:

1. insertion

2. substitution

3. deletion

im in k12 !

5 0
3 years ago
2. A cell in the leaf of a green plant performs both photosynthesis and cellular respiration, often at the same time. Which stat
quester [9]
<h3>♫ - - - - - - - - - - - - - - - ~Hello There!~ - - - - - - - - - - - - - - - ♫</h3>

➷ The correct answer would be D. Products of one process are used as some of the reactants for the other processes.

As you may know, the formula for photosynthesis is:

carbon dioxide + water ==> oxygen + glucose

And the formula for respiration is:

oxygen + glucose ==> carbon dioxide + water

The reactants for one are the products for the other and vice versa. This is why it would be the correct option.

<h3><u>✽</u></h3>

➶ Hope This Helps You!

➶ Good Luck (:

➶ Have A Great Day ^-^

↬ ʜᴀɴɴᴀʜ ♡

4 0
3 years ago
Read 2 more answers
How is energy released during respiration?
Kitty [74]

Answer:

During cellular respiration glucose is broken down in the presence of oxygen to produce carbon dioxide and water.

Explanation:

4 0
3 years ago
What occurs if a t cell binds to an antigen and the t cell does not receive a co-stimulatory signal?
tresset_1 [31]
The correct answer is that "the T cell enters a state of anergy".

The activation of T cells requires two signals: (1) antigen specific signal presented by an antigen presenting cell (either a macrophage or a dendritic cell) that activates t cell receptors and (2) co-stimulatory signals that is not antigen specific but rather found in the plasma membrane of the antigen presenting cell (i.e. CD28). In the absence of a co-stimulatory signal, the t cell will enter a state of anergy or the inability to produce an immune response toward an offending antigen.
4 0
3 years ago
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