A pollen, Most plants produce asexually , and pollen is produced.
Alfred Russel Wallace, a biologist, naturalist and anthropologist who studied life in the tropics of Indonesia came up with the same idea of natural selection as Charles Darwin and prompted Darwin to publish his Origin of Specie sooner rather than later. He also studied the geographic distribution of species and as as well he was a social activist who criticized capitalism and warned of damage to the environment from man's economic activities.
The controlled experiments are performed by the scientists, when they want to study the changes in the sample on changing a single variable. So, the correct answer is option (b).
In case, all variables are kept same, no changes would be observed in the experiment sample. A controlled experiment can be performed on living thing as well as non living. But, controlled experiment cannot be performed on the things which are influenced by a lot of variables, as they cannot create realistic results. So, the option (a), (c), and (d) are incorrect.
Answer:
SV = 30 ml/ beat.
HR = 80.
Explanation:
The formula to calculate SV is as follows:
SV = EDV- ESV.
Here EDV = 90ml (end diastolic volume), ESV = 60ml (end systolic volume) ans SV is stroke volume.
SV = 90-60
SV = 30ml/beat.
The formula to calculate HR is as follows:
HR = CO/SV
Here, HR is heart rate, CO is cardiac output = 2,400 ml/min and SV is stroke volume = 30ml/beat
HR = 2,400/30
HR = 80.
Thus, the SV is 30ml/best and HR is 80.
Answer:
C.
Explanation:
Ferns can grow taller than mosses because ferns are vascular plants and mosses are non-vascular. Most plants are vascular, which means they have a system of vessels that transport water and nutrients throughout the plant. For this reason, vascular plants can grow very tall; their vascular tissue moves needed molecules, such as water, all the way to the top of the plant or tree. Mosses, by contrast, are lacking this internal transport system and therefore cannot grow to be tall. They must rely on absorbing moisture directly from their environment and so must remain low to the ground where water is accessible. Mosses must live in moist, damp environments for this reason. Ferns are also found in shady, damp areas because like mosses, they use spores as their method of reproduction. Spores travel through water to unite and reproduce
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