Question

WILL GIVE MEDAL!!!

Answer 1

Scientists think that early organisms pumped oxygen into the atmosphere as a result of what process?

reproduction
photosynthesis
respiration
growth

Answer 2

@AdmiralAngel25

Answer 3

B

Answer 4

I didnt mean to put this under math

Answer 5

i have a few more

Answer 6

okay

Answer 7

The principles of selective breeding, practiced for centuries, set the foundation for the development of what theory in the 1800s?

atomic theory
theory of relativity
natural selection
big bang theory

Answer 8

C

Answer 9

Why is speciation difficult to observe?

It takes place over a long period of time.
It happens so quickly.
Outcomes are temporary changes that are not long-lasting.
Results must be observed with a microscope.

Answer 10

A

Answer 11

To calculate earth’s age, what method have scientists used to determine the ages of rock samples?

radiology
climatology
radiometric dating
crystallography

Answer 12

C

Answer 13

Scientists hypothesize that earth’s surface was a soup of water and chemicals in prehistoric times. How did this primordial soup come alive?

Lightning struck the earth and caused chemical changes.
Thick snow and ice covered the earth and lowered the temperature.
Solar flares increased the earth’s temperature.
All the water evaporated, and early life formed on dry land.

Answer 14

I would say A cause it obviously isn't B or D and I doubt solar flares would help create life in any way. Chemical changes are needed for life.

Answer 15

Which characteristic is true for a biological species?

They can reproduce only one time.
None of them resembles the others.
All have an identical appearance.
They produce fertile offspring.

Answer 16

D

Answer 17

I think D..

Answer 18

The geologic time scale is based primarily on the study of what?

fossils and geology
chemistry and landforms
the calendar and weather patterns
reptiles and wooly mammoths

Answer 19

A

Answer 20

The oldest fossils, cyanobacteria, were found in Australia. Which description of cyanobacteria is accurate?

non-photosynthetic organisms
eukaryotic cells with internal membranes
simple prokaryotic cells
complex multicellular organisms

Answer 21

no actually C..

Answer 22

Which list represents the scientific view of the first appearance of life on earth, beginning with the earliest and ending with the most recent?

cyanobacteria, trilobites, protists, dinosaurs
cyanobacteria, protists, dinosaurs, trilobites
dinosaurs, trilobites, cyanobacteria, protists
cyanobacteria, protists, trilobites, dinosaurs

Answer 23

you sure

Answer 24

Yes I'm sure. And this one is D

Answer 25

ok thanks thats all i have for science can u help me with history

Answer 26

i will tag u in the questions

Answer 27

Yeah well I gotta go soon. How many problems are there?

Answer 28

Which of these supports the hypothesis that life-forms have changed over time?

Prokaryotic cells lack both a nucleus and membrane-bound organelles.
Fossils of some ancient organisms differ from modern forms of life.
Organisms differ from one part of the world to another.
The atmosphere of the early earth was different from today’s atmosphere.

Answer 29

oh im unsure i would have to look

Answer 30

D

Answer 31

ok thanks got a 100!!!!!

Answer 32

Cool, np :)