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ella [17]
3 years ago
7

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large deposit of

dust that contained substances only found in asteroids . What most likely killed off the dinosaurs
Biology
2 answers:
Tomtit [17]3 years ago
8 0

the gigant asteroid could have caused gigant tsunamis and could made most of the volcanos of the world explode

stellarik [79]3 years ago
6 0
Ive heard that the large amounts of dust hindered the sun and growth of plants
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how does earth's rotation cause day and night A as earth rotates toward east, the sun appears to rise in the west and set in the
ioda
The Earth turns on its axis every day; it orbits the sun, just like all the other planets in our Solar System. You can cross out D and A, obviously. Which leaves us with answers B and C. Now, C says that the Earth turns clockwise, which is false; when viewed from space, they determined it turned counter-clockwise, which leaves us with B. Hope this helped
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In which phylum do we see plants with lignin, vascular system but no seeds?
andre [41]

Answer is the phylum is Pteridophyta. Pteridophytes are first land plants, examples ferns, <em>Lycopodium, Selaginella. </em>Members have liginified cells and developed conducting tissues called vascular system to conduct water and synthesized food. They reproduce through spores, seeds do not develop in pteridophytes.

4 0
3 years ago
Which mineral would be found in greatest concentration in the plasma of the marathon runners?
andre [41]
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6 0
3 years ago
Lactose is a carbohydrate found in milk. The
Rina8888 [55]

Options:

A. The enzyme lactase will speed up the breakdown of lactose in the small intestines.

B. Reactions that involve enzymes require more energy than reactions without enzymes.

C. The enzyme lactase will slow down the breakdown of lactose in the small intestines.

D. Lactase will require more energy to break down lactose, and less energy is required if it is not present.

Answer:

A. The enzyme lactase will speed up the breakdown of lactose in the small intestines.

Explanation:

A. The enzyme lactase will speed up the breakdown of lactose in the small intestines. - this is true. Lactase is an enzyme that catalyses the breakdown of lactose.  This means it greatly reduces the activation energy required for the breakdown of lactose, and the reaction will happen quicker.

B. Reactions that involve enzymes require more energy than reactions without enzymes. This is false. Reactions that involve enzymes require less energy that reactions without

C. The enzyme lactase will slow down the breakdown of lactose in the small intestines. This is false. It will speed it up

D. Lactase will require more energy to break down lactose, and less energy is required if it is not present.  This is false, more energy is required if it is not present

6 0
3 years ago
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