Potassium-40 has a half life of 1.251×billion<span> years</span><span>. To determine the percentage potassium-40 remaining after 3.9 billion years, divide
3.9 by 1.251, = 3.12.
This is the number of times the original amount of potassium-40 reduces by 50%. The remaining percentage is therefore 100%/(3.12 * 2) = 16.03%.</span>
Answer:
response to stimuli / tropism
Explanation:
The plants and animals always respond to stimuli. It is an innate character of all living things. When a bright light falls on the eye, it closes immediately. This is responding to the stimuli. When someone touches the leaves of touch-me-not plants it closes its leaves due to the external stimuli.
The plants respond to the light. Because it does photosynthesis in the presence of light. Therefore, the leaves and branches of the plants always bend towards the light. This process is called phototropism.
Similarly, the roots of the plants move towards gravity under the ground. This is called geotropism.
Besides phototropism and geotropism, other types of stimuli are there - hydrotropism(response to the water), chemotropism(response to certain chemicals).
That's why the plants growing on the windowsill move towards outside where light comes.
Answer: so in the beginning of mitosis there is only one nuclei but during telophase there are 2 nuclei
Explanation: I had the same exact question too but I did some research and I found the answer so here you go :) if I am missing anything please ask <3
Answer:
An object's <u>mass</u> will remain constant throughout the universe, but it's <u>weight </u>can change from planet to planet. If you increase the mass of a planet, what happens to its gravity? <u>Strength of Gravity increases.</u> If the gravity on a planet decreases, what happens to the weight of an object on that planet? <u>Weight Decreases</u>
Explanation:
