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damaskus [11]
2 years ago
15

how can a layer of rock containing a fossils could be present in a mountain wall that is several thousand feet above sea level

Biology
1 answer:
kondor19780726 [428]2 years ago
8 0
Because the plates could have caused the mountain when they pushed against each other and the fossil could have moved up with the mountain.
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What is a cell with two pairs of each set of chromosomes
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Answer:

Explanation:

A cell with two pairs of each set of chromosomes is called a [ diploid / haploid ] cell.

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3 years ago
The diagram represents three sections of a cell membrane showing three different methods involved in the transport of various mo
emmasim [6.3K]
Active transport is the process by which dissolved molecules move across a cell membrane from a lower to a higher concentration. In active transport, particles move against the concentration gradient - and therefore require an input of energy from the cell.
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Carbon-14 has a half-life of 5730 years. A sample of wood has been recovered by an archaeologist. The sample is sent to a labora
givi [52]

Answer: 4282.928 = 4283 years

Explanation:

Data given;

Carbon 14 half life = 5740

No (initial radiation) = 0.230 Bq/g

Nf (final radiation) = 0.137 Bq/g

First we find the decimal fraction of the remaining half life of the carbon 14

k = No / Nf

k = (0.137 / 0.230) = 0.595652

So to find how many half-life has elapsed, we say

(1/2)^n = k

(1/2) ^n = 0.595652

Therefore

n log 0.5 = log 0.595652

n = ( log 0.595652) / ( log 0.5)

n = 0.747457

To get the elapsed time or how old the sample is;

We say

Carbon 14 half-life × n

5730 yrs × 0.747457

= 4282.928

= 4283 years.

So the sample of the wood is 4283 years old.

4 0
3 years ago
Wht are the causes, risk and treatment for food poisoning​
pav-90 [236]

Answer:

Causes: Improper food handling, Bad Hygiene, Undercooked food.

Risk: Salmonella, weaken's immune system, and possibly end in hospital.

Treatment: Hydration, & medication.

4 0
3 years ago
Plant shrinks when places in saltwater due to osmosis of?
aivan3 [116]
Water.

osmosis always refers to the diffusion of WATER down a concentration gradient.

diffusion can be applied to any substance;
osmosis only applies to the diffusion of water.

in the situation described, osmosis occurs by water diffusing out of the plant, down the diffusion gradient (because the salt water effectively has a lower concentration of water than in the plant) and into the salt water.
5 0
2 years ago
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