All categories

2 years ago

What period of the Mesozoic era did birds first appear?

2 answers:

6 0

The dinosaurs and the mammals appeared during the Triassic period, roughly 225 million years ago. The dinosaurs went extinct 65 million years ago. The Mesozoic Era lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.

Komok [63]2 years ago

4 0

The earliest known birds appeared during the Jurassic Period of the Mesozoic Era, approximately 150 million years ago.

Thats what google said, sooo you decide what you want to do. :) Good luck!

You might be interested in

The various hormones secreted by the anterior pituitary that regulate the secretion of hormones from other endocrine organs are

Nat2105 [25]

Answer:

b. tropins

Explanation:

The anterior pituitary gland secretes many hormones. Some of these hormones regulate the secretion of hormones from other endocrine glands. These hormones are called tropins. For example, thyroid-stimulating hormone (TSH) is a tropin from anterior pituitary that makes the thyroid gland to release its hormones. Adrenocorticotropic (ACTH) and gonadotropins from anterior pituitary gland target the adrenal cortex and gonads respectively.

3 0

2 years ago

What causes the wind and ocean currents?

natima [27]

Liked my hardwork and make it brainliest

Explanation:

Ocean currents can be caused by wind,density differences in water masses caused by temperature and salinity variations,gravity,and events such as earthquakes and storms...Surface currents in the ocean are driven by global wind systems that are fueled by energy from the sun.

6 0

2 years ago

________ is the involuntary expulsion of the contents of the stomach and duodenum out the mouth

wlad13 [49]

Answer:

<h2>Vomiting</h2>

Explanation:

Vomiting is the involuntary expulsion of the contents of the stomach and duodenum out the mouth

Hope this help

plz mark brainliest

Have a nice day!!!!

7 0

2 years ago

Breathing involves the movement of diaphragm and Rib cage true or false

Elza [17]

Answer:

Explanation:

It's a true statement as,

When we inhale the diaphragm moves downwards and the rib cage moves upwards and outwards to let enter the outside air containing oxygen come in.
While we exhale the diaphragm comes to its position and the rib cage move downwards and inwards to let out the inside carbon-dioxide and other games out.

Hence, we can conclude that breathing involves the movement of diaphragm and Rib cage.

4 0

2 years ago

The largest molecules in organisms are _____.

FromTheMoon [43]

Nucleic Acids are the largest molecule

8 0

2 years ago

Read 2 more answers